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Aristarchus Of Samos

Aristarchus of Samos

]] Aristarchus (310 BC - circa 230 BC) was a Greek astronomer and mathematician, born in Samos, Greece. He is the first recorded person to propose a heliocentric model of the solar system, placing the Sun, not the Earth, at the center of the known universe (hence he is sometimes known as the "Greek Copernicus"). His astronomical ideas were not well-received and were subordinated to those of Aristotle and Ptolemy, until they were successfully revived and developed by Copernicus nearly 2000 years later. See also: Aristarchus, a bright crater on the Moon, and asteroid 3999 Aristarchus, both named after the astronomer.

Heliocentrism

The only work of Aristarchus which has survived to the present time, On the Sizes and Distances of the Sun and Moon, is based on a geocentric worldview. We know through citations, however, that Aristarchus wrote another book in which he advanced an alternative hypothesis of the heliocentric model. Archimedes wrote: : "You King Gelon are aware the 'universe' is the name given by most astronomers to the sphere the centre of which is the center of the Earth, while its radius is equal to the straight line between the center of the Sun and the center of the Earth. This is the common account as you have heard from astronomers. But Aristarchus has brought out a book consisting of certain hypotheses, wherein it appears, as a consequence of the assumptions made, that the universe is many times greater than the 'universe' just mentioned. His hypotheses are that the fixed stars and the Sun remain unmoved, that the Earth revolves about the Sun on the circumference of a circle, the Sun lying in the middle of the orbit, and that the sphere of fixed stars, situated about the same center as the Sun, is so great that the circle in which he supposes the Earth to revolve bears such a proportion to the distance of the fixed stars as the center of the sphere bears to its surface." Aristarchus thus believed the stars to be infinitely far away, and saw this as the reason why there was no visible parallax, that is, an observed movement of the stars relative to each other as the Earth moved around the Sun. The stars are in fact much farther away than was assumed in ancient times, which is why stellar parallax is only detectable with telescopes. But the geocentric model was assumed to be a simpler, better explanation for the lack of parallax. The rejection of the heliocentric view was apparently quite strong, as the following passage from Plutarch suggests (On the Apparent Face in the Orb of the Moon): : "[Cleanthes, a contemporary of Aristarchus] thought it was the duty of the Greeks to indict Aristarchus of Samos on the charge of impiety for putting in motion the Hearth of the universe [i.e. the earth], . . . supposing the heaven to remain at rest and the earth to revolve in an oblique circle, while it rotates, at the same time, about its own axis."

Size of the Moon

Aristarchus observed the Moon moving through the Earth's shadow during a lunar eclipse. He estimated that the diameter of the Earth was 3 times the Moon's diameter. Using Eratosthenes' calculation that the Earth was 42,000 km in circumference, he concluded that the Moon was 14,000 km in circumference. The Moon has a circumference of about 10,916 km.

Distance to the Sun

Aristarchus argued that the Sun, Moon, and Earth form a near right triangle at the moment of first or last quarter moon. He estimated that the angle was 87°. Using correct geometry, but inaccurate observational data, Aristarchus concluded that the Sun was 20 times farther away than the Moon. The Sun is actually about 390 times farther away. He pointed out that the Moon and Sun have nearly equal apparent angular sizes and therefore their diameters must be in proportion to their distances from Earth. He thus concluded that the Sun was 20 times larger than the Moon. This is also incorrect, although logical. It does, however, suggest that the Sun is clearly larger than the Earth, which can be taken to support the heliocentric model.

External links

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- [http://adsabs.harvard.edu//full/seri/JRASC/0075//0000029.000.html Biography: JRASC, 75 (1981) 29]

References

- Heath, Sir Thomas. Aristarchus of Samos - The Ancient Copernicus, A history of Greek astronomy to Aristarchus together with Aristarchus' treatise on the sizes and distances of the sun and moon, a new Greek text with translation and notes. Category:310 BC births Category:230 BC deaths Category:Greek and Roman astronomers ja:アリスタルコス

310 BC

Centuries: 5th century BC - 4th century BC - 3rd century BC Decades: 360s BC 350s BC 340s BC 330s BC 320s BC 310s BC 300s BC 290s BC 280s BC 270s BC 260s BC Years: 315 BC 314 BC 313 BC 312 BC 311 BC - 310 BC - 309 BC 308 BC 307 BC 306 BC 305 BC ----Events
- Cassander, the Regent of Macedon, probably has the boy-king Alexander IV and his mother Roxane secretly murdered at some point during this year, although the dead king is still recognized officially for five more years.
- Antigonus comes up against Seleucus in Babylon. There is considerable fighting within the city between supporters of the rival generals.
- Battle of Lake Vadimo: The Romans under Q. Fabius Rullianus defeated the Etruscans during the Second Samnite War and was forced to make peace.
- Agathocles, tyrant of Syracuse, leads a counterstrike against Carthage
- Antigonia Troas (later known as Alexandria Troas) and Antigoneia (later known as Nicaea) are founded by Antigonus I Monophthalmus Births
- Aratus, Macedonian Greek mathematician, astronomer, meteorologist, botanist and poet (possibly born in 315 BC)
- Aristarchus, Greek astronomer and mathematician Deaths
- Kidinnu, Babylonian astronomer (approximate year).
- Heraclitus of Heraclea
- Pytheas, Greek merchant, geographer and explorer Category:310s BC

230 BC

Centuries: 4th century BC - 3rd century BC - 2nd century BC Decades: 280s BC 270s BC 260s BC 250s BC 240s BC - 230s BC - 220s BC 210s BC 200s BC 190s BC 180s BC Years: 235 BC 234 BC 233 BC 232 BC 231 BC - 230 BC - 229 BC 228 BC 227 BC 226 BC 225 BC ---- Events
- Sieve of Eratosthenes developed.
- The Roman Lucius Coruncanius is assaulted and killed while on a diplomatic mission to Queen Teuta, an event leading to the First Illyrian War.
- Temple of Horus built by Ptolemy III of Egypt.
- Hasdrubal succeeds his father-in-law Hamilcar Barca, slain in battle, as ruler of Carthaginian Spain, and establishes Carthago Nova .
- State of Qin conquered the state of Han in China.
- King Kubera rules Bhattiprolu in Guntur, Andhra Pradesh, India
- Diodotus II of the Greco-Bactrian Kingdom is killed and succeeded by Euthydemus I (according to Polybius).
- The Dying Gaul is sculpted in Greece. Births
- Prusias I Chlorus later king of Bithynia Deaths
- Ad Herbal, Commander (Admiral) of the Carthaginian fleet
- Aristarchus of Samos, Greek philosopher, astronomer, mathematician
- Asoka, Emperor of India
- Hamilcar Barca, commander of Carthaginian army
- Lucius Coruncanius
- Diodotus II of the Greco-Bactrian Kingdom. Category:230s BC

Greeks

:For other uses of the name "Greek", see Greek (disambiguation) The Greeks are a nation and ethnic group, who have populated Greece from the 17th century BC until the present day.

Identity of the Greek people

17th century BC

Classical and Roman

Herodotus states that the Athenians declared, before the battle of Plataea, that they would not go over to Mardonius, because in the first place, they were bound to avenge the burning of the Acropolis; and, secondly, they would not betray their fellow Greeks, to whom they were bound by:
- A common language¹ (the use of one of the dialects of the Greek language)
- Common blood² (descent from Hellen, son of Deucalion)
- Common shrines, statues and sacrifices (practice of the ancient Greek religion)³ and
- Common habits and customs. This notion that the Greeks had a common descent was then comparatively recent. As Thucydides observes, the name of Hellas spread from a valley in Thessaly to the Greek-speaking peoples after the formation of the text of Homer (the Panellenes of Il. 2.530 are the troops of Thessaly, contrasting with the Achaeans), not long before his own time. This places the idea in the Archaic period, when Greek-speakers discovered that the world was wider, wealthier, and more cultured than they had hitherto imagined. Homer's Trojan War is, indeed, a conflict among Greeks: the Trojans speak Greek, bear Greek names, and worship the Greek gods; and Priam is descended from Zeus (see Alaksandus). The Carians are the only people Homer considers barbarophonoi. Nor did the late and schematic myth of the sons of Hellen ever convince other mythographers to comply with it. Theseus is descended from Erechtheus, son of the Earth; Oedipus from the Phoenician Cadmus; Agamemnon from Phrygian Pelops; Heracles and Perseus from Egyptian Danaus. Whole cities were not descended from Hellen: Athens, Lemnos, and the Cretans were Pelasgian; and 1 Maccabees 12:21 attests that the Spartans are children of Abraham. The myth of Hellen combined into one group the smaller tribes that participated in the Delphic Amphictyon, such as the Aeolians, the Achaeans, and the Dorians. Traces of the older distinctions remained; Dorians were forbidden in the Parthenon; although the Spartan king Cleomenes I claimed this did not apply to him — as a descendant of Heracles, he was an Achaean. (As in this example, the Greeks almost always reckoned descent only through the male line.) So the exact nature of Greek identity has been an open question since ancient times. It has not become clearer with time: descent is at best a matter of tradition, and the Greeks have altered their language, religion, and customs since Herodotus. Nevertheless, there has been, in practice, a continuous Greek identity since ancient times, containing at least those who chose to be Greek and who had citizenship in a Greek city, or membership of a Greek community. As early as the 5th century BC, Isocrates, after speaking of common origin and worship, says: "the name Hellenes suggests no longer a race but an intelligence, and... the title Hellenes is applied rather to those who share our culture than to those who share a common blood". [http://www.perseus.tufts.edu/cgi-bin/ptext?doc=Perseus:text:1999.01.0144:speech=4:section=50|Panegyric 4.50]. After the 4th century BC, Greek became the lingua franca of the East Mediterranean region and was widely spoken by educated non-Greeks. After the 4th century AD, Greeks became Christian. (In the Judeo-Christian tradition, Greeks are descended from Javan, son of Japheth).

Byzantine and Ottoman

Japheth family of Byzantine emperors.]] After the creation of the Eastern Roman Empire, Greek culture shifted from Hellenic (Greek pagan) to Romaic (Greek paganism fused with Christianity), and the word "Hellene" became associated with the pagan past. All Roman citizens, and thus all subjects of the Byzantine Empire, were Romaic. Distinctions between nationalities among the citizens of the Eastern Roman Empire did not become extinct, but became secondary to religious considerations as the renewed Empire used Christianity to maintain its cohesion. It was religion that divided the Empire from the Muslims; and, along different lines, it came to divide the Empire from the Franks, Armenians, Copts, and Syrians. Greek nationalism was reborn after the fall of Constantinople to the Crusaders of the Fourth Crusade in 1204, and the establishment of a number of Greek kingdoms (such as the Empire of Nicaea and the Despotate of Epirus). When the empire was revived in 1261, it became essentially a Greek national state. Adherence to Greek Orthodox rites became the defining characteristic of the Greek people. During the Ottoman rule of Greece, Greek Orthodox Christianity was the only Greek community; the Ottomans considered religion to be the defining characteristic of "national" groups (millet). Greeks who adopted Islam during that period were considered 'Turks'. Following this definition, Alexander Ypsilanti expected the Moldavians and Wallachians, being Greek Orthodox, to rise for Greek independence; but they did not.

Modern independence

This strong relation between Greek national identity and Greek Orthodox religion continued after the creation of the modern Greek state in 1830, and when the Treaty of Lausanne was signed between Greece and Turkey in 1923, the two countries agreed to use religion as the determinant for ethnic identity. However, in many important respects, the Greek state adhered from its founding to remarkably secular principles. For instance, Jews were granted full citizens rights in 1830, the year Greece's independence was formally recognized, thus making Greece the second state in Europe (after France) with an emancipated Jewish community. Today, the deeper integration of Greece into the Western strategic system and the effects of migration (both emigration from Greece in the 1950s and 1960s, and immigration into Greece in more recent years) have led to a perception of Greek national identity similar to that of other Western European nations. The Greek Orthodox faith is now only one of a variety of factors that yield Greek identity.

Names used for the Greek people

Main Article: Names of the Greeks. Names of the Greeks Throughout the centuries, the Greeks have been known by a number of names, including:
- Hellenes (Έλληνες) - In mythology, Hellen, son of Deucalion and Pyrrha, received from the nymph Orseis three sons, Aeolus, Dorus and Xuthus, each of which founded a primary tribe of Hellas; Aeolians, Dorians, Achaeans and Ionians. Originally, only a small tribe in Thessaly were called Hellenes, but the word soon extended to the rest of the peninsula and came to represent all Greek people. In early Christian times it was sometimes used to mean "pagans". It remains in Greece today, the primary national name.
- Greeks (Γραικοί) - In mythology, Graecus was the brother of Latinus and niece to Hellen. It was the name of a Boeotian tribe that migrated to Italy in the 8th century BC and probably through contact with natives there brought the term to represent all Hellenes, which then established itself in Italy and in the West in general.
- Romioi (Ρωμιοί) - Romans is the political name by which the Greeks were known during Late Antiquity and the Middle Ages. The name originally signified the inhabitants of the city of Rome in Italy, but with the elevation of the Greeks in the Roman Empire, it soon lost its connection with the Latins. Emperor Caracella granted all free people in the Roman Empire citizenship, but the Greeks transmogrified the term Roman into the term Romaion. The term was created in order to establish a dualistic connotation that represented the Greeks' Roman citizenship and their Hellenic ancestry. The word Romaions came to represent the Greek inhabitants of the Byzantine Empire. It remains still in use today in Greece, being the most popular national name after Hellene.
- Yunani (Ίωνες) - Yunani, from the Persian Yauna, itself a transliteration of the Greek Ionia, is the name by which the Greeks are known in the East today. The term became established in the ancient Middle East from the Persians, who in contact with the Ionian tribes in western Asia Minor in the 6th century BC, extended the name to all Hellenes.
- Achaeans, Argives, and Danaans are names used interchangeably by Homer, to signify the Greek allied forces.

History of the Greeks

The history of the Greek people is closely associated with the history of Greece itself. While Greeks have migrated away from Greece for many centuries, historically these colonists or emigrants remained close to their homeland. During the Ottoman rule of Greece, a number of Greek enclaves around the Mediterranean were cut off from the core, notably in Southern Italy, the Caucasus, Syria,and Egypt. During the 20th century, a huge wave of migration to the United States, Australia, Canada,and elsewhere created a Greek diaspora which, in many ways, has developed a cultural identity separate from that of the Greeks who remained home.

Greeks around the world

Outside Greece and Cyprus, large Greek communities can be found in a number of countries:
- United States: 1,153,295 (self-reported heritage); 365,435 speak Greek at home. (2000 Census). See Greek-Americans.
- Germany: 363,000 (1995, based on citizenship)
- Canada: 203,354 born in Greece⁴ (1996 Census); total approx. 320,000 Canadians of Greek heritage (2003 community estimates). See Greek-Canadians
- Australia: 260,000 speak Greek at home (1996 Census); 336,782 self-reported Greek origin (1986 Census[http://www.hellenism.net/cgi-bin/display_article.html?s=49&a=172]). See Greek-Australians
- Albania: 36,000-300,000 by different estimates: 36,000 (Albanian Institute of Statistics, reported by [http://www.state.gov/r/pa/ei/bgn/3235.htm US Dept. of State], 2005); 62,500 (Albanian census, ibid., 1989); 100,000 ([http://www.cia.gov/cia/publications/factbook/geos/al.html CIA World Factbook], 1989); 150,000 ([http://www.greekhelsinki.gr/pdf/ghm-greeks-albanians.PDF Greek Helsinki Monitor estimate], 1994); 280,000 (Greek estimate reported by [http://www.unpo.org/news_detail.php?arg=23&par=46 Unrepresented Nations and Peoples Organization], 2004).
- Former Soviet Union: Approx. 200,000 remain; 300,000 have migrated to Greece (2003, figures not reliable). Significant Greek communities can also be found in the United Kingdom (mostly Greek Cypriots), Argentina, Mexico, Sweden and South Africa.

Timeline of Greek migrations

South Africa Practically every event in this timeline is disputed by one theory or another. This timeline attempts to represent the mainstream views of modern Greek historians. Some key historical events have also been included for context, but this timeline is not intended to cover history not related to migrations. For more information on the historical context of these migrations, please see History of Greece.
- 20th century BC — Greek tribes migrate into Macedonia (most likely from the Caucasus region), and establish some settlements in peninsular Greece.
- 17th century BC — Decline of Minoan civilization, possibly due to the eruption of Thera. Greek tribes (Achaeans, Ionians) enter southern Greece, establishing the Mycenaean civilization. Greek history begins.
- 13th century BC — First colonies established in Asia Minor.
- 11th century BC — Doric tribes move into peninsular Greece.
- 9th century BC — Major colonization of Asia Minor.
- 8th century BC — First colonies established in Sicily and Southern Italy.
- 6th century BC — Colonies established across the Mediterranean and the Black Sea
- 4th century BC — Campaign of Alexander the Great; colonies established in Egypt and the Middle East.
- 2nd century BC — Conquest of Greece by the Roman Empire.
- 4th century — Establishment of Eastern Roman Empire. Migrations of Greeks throughout the Empire, and of non-Greeks into Greece over the next 6 centuries.
- 13th century — Dissolution of Eastern Roman Empire. Re-emergence of Greek nationalism.
- 14th century — Eastern Roman Empire recreated and refashioned as a Greek state.
- 15th century — Conquest of Greece by the Ottoman Empire . Greek diaspora into Europe begins. Turkish settlements in Greece.
- 1830s — Creation of the Modern Greek State. Immigration to the New World begins.
- 1913 — Macedonia partitioned; Population exchange with Bulgaria; Greek presence in Bulgaria and presence of Slavic peoples in Greece practically end.
- 1910s — Genocide of Pontian Greeks; approximately 350,000 killed.
- 1923 — Treaty of Lausanne. 1.3 million Greeks removed from the newly created Republic of Turkey; 500,000 Turks and other Muslims removed from Greece. Muslim Greeks remain in Turkey. 50,000 Christian Greeks in Constantinople and a number of Muslims in Greek (Western) Thrace excluded from the exchange.
- 1948 — Greek Civil War. Tens of thousands of Greek communists and their families flee into Eastern Bloc nations. Thousands settle in Tashkent.
- 1950s — Massive emigration of Greeks to West Germany, the United States, Australia, Canada, and other countries. Large Greek community in Alexandria flees Nasser's regime in Egypt.
- 1955 — Istanbul Pogrom against Greeks. Exodus of Greeks from the city accelerates; less than 2000 remain today.
- 1960s — Republic of Cyprus created, as a joint Greek–Turkish state. Economic emigration continues.
- 1974 — Turkish invasion of Northern Cyprus. Almost all Greeks living in northern Cyprus flee to the south; many flee to the United Kingdom.
- 1980s — Civil war refugees allowed to remigrate to Greece. Reverse migration of Greeks from Germany also begins.
- 1990s — Collapse of Soviet Union. Approx. 300,000 ethnic Greeks migrate from Georgia, Armenia and southern Russia to Greece. Approx 35,000 ethnic Greeks migrate from Albania to Greece.
- 2000s — Schengen Treaty increases population mobility within the European Union. Numbers indicate a trend of reverse migration of Greeks from the United States and Australia beginning.

Footnotes

¹In Greek: homoglosson () + ²In Greek: homaimon () ³Compare the Christian Greek and Demotic term omothriskon (). ⁴Includes non-Greeks born in Greece; excludes Greeks not born in Greece; excludes second-generation Greek-Canadians.

Miscellaneous topics

- Greece
- Greek Language
- History of Greece
- Ancient Greece
- Greek mythology
- Hellenistic civilization
- Byzantine Empire
- Byzantium
- List of Greeks
- Greek American
- Category:Greek-Americans
- Greek Canadians
- Greek Australian

External links

- [http://www.chs.harvard.edu/activities_events.sec/conferences.ssp/conf_greeks_on_greekness.pg Greeks on Greekness: The Construction and Uses of the Greek Past among Greeks under the Roman Empire], a conference on how Greeks imagined Greekness in relation to the past during the first two centuries of the Roman Empire. Category:Ethnic groups of Greece Category:Ethnic groups of Macedonia Category:Indo-European peoples

Astronomer

An astronomer or astrophysicist is a scientist whose area of research is astronomy or astrophysics. astrophysicss, and being the first to study the surface of the moon]] Astronomy is generally thought to have begun in ancient Babylon by the Persian Zoroastrian priests (the magi). Recent studies of Babylonian records have shown them to be extremely accurate for the ancient night sky. Following the Babylonians, the egyptians also had an emphasis on observations of the sky. Mixtures of religious interpretations of the sky, as mythic tales of the gods, led to a duality that we now identify as astrology. It is important to recognize that before about 1750, there was no distinction between astronomy and astrology. Unlike most scientists, astronomers cannot directly interact with the celestial bodies, and so instead must resort to detailed observation in order to make discoveries. Generally, astronomers use telescopes or other imaging equipment to make such observations.

Famous astronomers

Mathematician

A mathematician is a person whose area of study and research is mathematics. Today, most mathematicians are professors at a university or other research institution; however, a minority have a non-academic career and are often known as amateur mathematicians. While a number of misinformed people may believe mathematics is fully understood (as it is often presented this way in elementary textbooks), in fact, there is ongoing research into many areas of mathematics. In fact, the publication of new discoveries in mathematics continues at an immense rate in hundreds of scientific journals, many of them devoted to mathematics and many devoted to subjects to which mathematics is applied (such as theoretical computer science and theoretical physics). Unlike the other sciences, research in mathematics generally does not consist of performing experiments. Rather, mathematics is about problem-solving, where truths are deduced from other known truths. Computer experiments and other numerical evidence might be a part of this process, but in the end, mathematics research is about constructing proofs of theorems. In particular, calculation is not a big part of mathematics research, and mathematicians need not have any extraordinary ability in adding or multiplying numbers. See mental calculators to read about prodigies at performing such calculations.

Motivation

Mathematicians are typically interested in finding and describing patterns that may have originally arisen from problems of calculation, but have now been abstracted to become problems of their own. Problems have come from physics, economics, games, generalizations of earlier mathematics, and some problems are simply created for the challenge of solving them. Although much mathematics is not immediately useful, history has shown the eventually applications are found. For example, number theory originally seemed to be without purpose, but after the invention of computers it gained countless applications to algorithms and cryptography.

Differences

Mathematicians differ from philosophers in that the primary questions of mathematics are assumed (for the most part) to transcend the context of the human mind; the idea that "2+2=4 is a true statement" is assumed to exist without requiring a human mind to state the problem. Not all mathematicians would strictly agree with the above; the philosophy of mathematics contains several viewpoints on this question. Mathematicians differ from physical scientists such as physicists or engineers in that they do not typically perform experiments to confirm or deny their conclusions; and whereas every scientific theory is always assumed to be an approximation of truth, mathematical statements are an attempt at capturing truth. If a certain statement is believed to be true by mathematicians (typically as special cases are confirmed to some degree) but has neither been proven nor disproven to logically follow from some set of assumptions, it is called a conjecture, as opposed to the ultimate goal, a theorem that is proven true. Unlike physical theories, which may be expected to change whenever new information about our physical world is discovered, mathematical theories are static. Once a statement is considered a theorem, it remains true forever.

Demographics

As is the case in many scientific disciplines, the field of mathematics has been disproportionately dominated by men. Among the minority of prominent female mathematicians are Emmy Noether (1882 - 1935), Sophie Germain (1776 - 1831), Sofia Kovalevskaya (1850 - 1891), Rózsa Péter (1905 - 1977), Julia Robinson (1919 - 1985), Mary Ellen Rudin, Eva Tardos, Émilie du Châtelet, Mary Cartwright and Marianna Csörnyei.

Quotes

...beware of mathematicians, and all those who make empty prophecies. The danger already exists that the mathematicians have made a covenant with the devil to darken the spirit and to confine man in the bonds of Hell. :-Saint Augustine, De Genesi ad Litteram (actually "mathematicians" in this context refers mainly to astrologers and such) A mathematician is a machine for turning coffee into theorems. :-Paul Erdős Die Mathematiker sind eine Art Franzosen; redet man mit ihnen, so übersetzen sie es in ihre Sprache, und dann ist es alsobald ganz etwas anderes. (Mathematicians are [like] a sort of Frenchmen; if you talk to them, they translate it into their own language, and then it is immediately something quite different.) :-Johann Wolfgang von Goethe Some humans are mathematicians; others aren't. :-Jane Goodall (1971) In the Shadow of Man

Jokes

Several old jokes common amongst the scientific disciplines illustrate the difference between the mathematical mind and that of other disciplines. One goes as follows: :An engineer, a physicist, and a mathematician are all staying at a hotel one night when a fire breaks out. The engineer wakes up and smells the smoke; he quickly grabs a garbage pail to use as a bucket, fills it with water from the bathroom, and puts out the fire in his room. He then refills the pail and douses everything flammable in the room with water. He then returns to sleep. :The physicist wakes up, smells the smoke, jumps out of bed. He picks up a pad and pencil and makes some calculations, glancing frequently at the flames. He then measures exactly 15.6 liters of water into the garbage pail, and throws it on the flames, which are extinguished. Smiling, he returns to sleep. :Finally the mathematician wakes up. He too grabs a pad and begins furiously writing; glancing at the flames; and then writing more. After a while he gets a satisfied look on his face; entering the bathroom, he produces a match, lights it, and then extinguishes it with a bit of running water. "Aha! A solution exists," he murmurs - and returns to his slumbers. Another joke goes thus: :Three men are flying in a hot air balloon and suddenly they realize that they are lost. Luckily they see a man plowing a field and ask, "Where are we?". The man on the ground thinks for a minute and then answers, "You are in a hot air balloon". One of the men in the air then says to his friends, "He was a mathematician - he thought before answering, his answer was totally right and totally useless" And another: :An astrologer, a chemist, and a mathematician are on a bus during their first visit to Scotland. They see a black sheep grazing alone in a pasture as they drive by. The astrologer excitedly exclaims, "Ah, this shows Scottish sheep are black!" The chemist didactically corrects him: "No, no, it just shows some Scottish sheep are black." The mathematician then says, "Actually, we can only be sure there is at least one Scottish sheep of which at least one side is black" And finally: : An experiment is being made. A physicist (or an engineer) and a mathematician are asked to boil hot water, but the kettle is in the living room. The physicist goes to the living room, takes the kettle, returns to the kitchen and puts it on the stove and boils the water. The mathematician does the same. In the second stage, the kettle is in the kitchen and the two are again asked to boil hot water. The physicist simply puts the kettle on the stove and boils the water. However, the mathematician takes the kettle, puts it in the living room and declares: "We have already solved this problem!"

Links and references

References

- A Mathematician's Apology, by G. H. Hardy. Memoir, with foreword by C. P. Snow.
- Reprint edition, Cambridge University Press, 1992; ISBN 0521427061
- First edition, 1940
- Dunham, William. The Mathematical Universe. John Wiley 1994.

External links

- [http://www-history.mcs.st-and.ac.uk/history/index0.html The MacTutor History of Mathematics archive], a very complete list of detailed biographies.
- [http://genealogy.math.ndsu.nodak.edu/ The Mathematics Genealogy Project], which allows to follow the succession of thesis advisors for most mathematicians, living or dead. Category:Mathematical science occupations
- ja:数学者 ko:수학자 th:นักคณิตศาสตร์ __NOTOC__

Greece

Greece, (Greek: Ελλάδα, older form: Ελλάς, Hellas), officially the Hellenic Republic (Greek: Ελληνική Δημοκρατία, Ellinikí Dimokratía; see also List of traditional Greek place names), is a country in southern Europe on the tip of the Balkan peninsula. It has land boundaries with Bulgaria, The Republic of Macedonia, and Albania to the north and with Turkey to the east. The waters of the Aegean Sea border Greece to the east, and those of the Ionian and Mediterranean Sea to the west and south. Regarded by many as the cradle of Western civilization and the birthplace of democracy, Greece has a long and rich history during which its culture has proven especially influential in Europe, North Africa, and the Middle East.

Name

Main article: Names of the Greeks The historical name of Greece in Greek is Ellás . This name is also written Hellas in English, following the ancient Greek pronunciation . In modern Greek it is called more commonly Ελλάδα Elládha . The mythical ancestor of the Greeks is the eponymous Hellen. The name of Greece in European languages (English: Greece, French: Grèce, Portuguese: Grécia, Spanish and Italian: Grecia, Welsh: Groeg, German: Griechenland, Dutch: Griekenland, Russian: Греция, etc.) comes from a different root: Graikós (via Latin Graecus) which according to Aristotle was an ancient name for the Greeks. The Japanese name is ギリシャ (Girisha), lent from European languages. On the other hand, the name of Greece in some Middle Eastern and Eastern languages (Turkish: Yunanistan, Arabic: يونان, Hebrew: יוון, ancient Persian: Yaunâ, Indian Pali: Yona, Malay and Indonesian: Yunani) derives from the Greek toponym Iōnía. Norwegian, Chinese (希腊 Xila) and Vietnamese are three of the few languages apart from Greek in which the name Hellas predominates. An interesting and unique form is kept in Georgian. In ancient times, Georgians (Colchs and Iberians) called Greeks ბერძენი berdzeni. This form derives from the Georgian word ბრძენი brdzeni – wise. According to Georgian historians, the name is connected with the notion that philosophy was born in Greece. Modern Georgians still call Greeks ბერძენი berdzeni and Greece საბერძნეთი saberdznet'i, 'Greeks' land' or literally 'land of the wise'. Some Greeks prefer the name Hellas for the country and Hellenes for the people even in English. See Hellenes for discussion.

History

Hellenes Main Article: History of Greece.

Prehistory and antiquity

The shores of Greece's Aegean Sea saw the emergence of the first civilizations in Europe, namely the Minoan and the Mycenaean. After these, a Dark Age followed until around 800 BC, when a new era of Greek city-states emerged establishing colonies along the Mediterranean. Greek culture would later become the basis of the Hellenistic civilization that followed the empire of Alexander the Great. For a detailed history of Ancient Greece see the relevant articles in: History of Greece.

Roman rule and Middle Ages

Militarily, Greece itself declined to the point that the Romans conquered the land (168 BC onwards), though, in many ways, Greek culture would in turn conquer Roman life. Greece became a province of the Roman Empire, but Greek culture continued to dominate the eastern Mediterranean. When the Roman Empire finally split in two, the Eastern Roman Empire, known as the Byzantine Empire, centered around Constantinople (known in ancient times as Byzantium), remained Greek in nature, encompassing Greece itself. From the 4th century to the 15th century, the Byzantine Empire survived eleven centuries of attacks from the north, west and east until Constantinople fell on May 29 1453 to the Ottoman Empire, when Constantine XI, the last emperor of the Palaeologus dynasty, fell. Greece was gradually conquered by the Ottomans during the 15th century.

Ottoman rule

While the Ottomans completed the conquest of the Greek Mainland, two Greek migrations occurred. The first migration saw the Greek intelligentsia migrate to Western Europe and contribute to the advent of the Renaissance. The second migration of Greeks left the plains of the Greek peninsula and resettled in the mountains. The Ottomans were unable to create a permanent military and administrative presence in these mountainous regions. As a result some Greek mountain clans across the peninsula, as well as some islands, were able to maintain a status of independence. The Sphakiots of Crete, the Souliots from Souli of Epirus, and the Maniots from Mani of Peloponnesus were the most resilient mountain clans throughout the Ottoman Empire. By the end of the 16th century and until the 17th century, Greeks began to migrate back to the plains and cities, adding to the increasing urban population. The millet system contributed to the ethnic cohesion of Orthodox Greeks by segregating the various peoples within the Ottoman Empire based on religion. The Orthodox Church, a religious institution with a strong national character, helped the Greeks from all geographical areas of the peninsula (i.e. mountains, plains, and islands) to preserve their ethnic, cultural and linguistic heritage during the years of the Ottoman rule (although at the time it was not stictly speaking a "Greek" church - the Greek Church was instituted after the liberation). The Greeks who remained on the plains during Ottoman occupation were either Christians, who dealt with the burdens of foreign rule, or to a considerable extent Crypto-Christians (Greeks Muslims who were secret practitioners of the Orthodox faith) in order to avoid heavy taxation. The Greeks who converted to Islam and were not Crypto-Christians became Turks in the eyes of Orthodox Greeks. There were no "Greek Muslims", and no "Christian Turks". As a result, religion played an integral part in the formation of the Modern Greek and other post-Ottoman national identities. Turks

Creation of the modern Greek state

The Ottomans ruled Greece until the early 19th century. In 1821, the Greeks rebelled and declared their independence, but did not succeed in winning it until 1829. The elites of powerful European nations saw the war of Greek independence, with its accounts of Turkish atrocities, in a romantic light (see, for example, the 1824 painting the Massacre of Chios by Eugène Delacroix). Scores of non-Greeks volunteered to fight for the cause — including people like Lord Byron. At times the Ottomans seemed on the verge of entirely suppressing the Greek revolution but were eventually forced to give in by the direct military intervention of France, Great Britain and Russia. This was the prelude of the so called "Eastern Question", the gradual dismemberment of the decaying empire by the western powers. The Russian ex-minister of foreign affairs, Ioannis Kapodistrias, himself a Greek, actually a noble from the Ionian Islands, a British protectorate in the Ionian Sea, was chosen as President of the new Republic following Greek independence. That republic disappeared when a few years later Western powers helped turn Greece into a monarchy, the first king coming from Bavaria and the second from Denmark. During the 19th and especially the early 20th centuries, in a series of wars with the Ottomans, Greece sought to enlarge its boundaries to include the ethnic Greek population of the Ottoman Empire (the Ionian State however was donated by Britain upon the arrival of the new king from Denmark in 1863, and Thessaly was ceded by the Ottomans without a fight). Greece would slowly grow in territory and population until reaching its present configuration in 1947. In World War I, Greece sided with the entente powers against Turkey and the other Central Powers. In the war's aftermath, the Great Powers awarded parts of Asia Minor to Greece, including the city of Smyrna (known as Izmir today) which had a large Greek population. At that time, however, the Turkish nationalists, led by Mustafa Kemal Atatürk, denounced the Sultan's government in Istanbul and organised a new one in Ankara. During the Greco-Turkish War (1919-1922) the Turks eventually defeated the Greek armies and regained control of Asia Minor. Soon afterwards, the Treaty of Lausanne was signed, fixing the borders to this date. A population exchange was included in the agreement and immediately afterwards, hundreds of thousands of Turks then living in mainland Greek territory left for Turkey in exchange for about a million Greeks living in Turkey. The refugees from Asia Minor revived the population, provided cheap labour and hellenized the now depopulated regions, especially in Macedonia. In 1936, General Ioannis Metaxas established an authoritarian conservative dictatorship in Greece, seen as similar to Antonio Salazar's "New State". Greece under Metaxas is also compared to Spain at the time, although it lacked the political violence associated with Francisco Franco's regime. Despite the country's numerically small and ill-equipped armed forces, Greece made an important contribution to the Allied efforts in World War II. At the start of the war Greece sided with the Allies and refused to give in to Italian demands (see Oxi Day). Italy invaded Greece on 28 October 1940, but Greek troops repelled the invaders after a bitter struggle (see Greco-Italian War). This marked the first Allied victory in the war. Hitler then reluctantly stepped in, primarily to secure his strategic southern flank. Troops from Germany, Hungary, Bulgaria, and Italy successfully invaded Greece, overcoming Greek, British, Australian, and New Zealand units within weeks. To reduce the threat of a counter-offensive by Allied forces in Egypt, the Germans attempted to seize Crete in a massive attack by paratroops. Allied forces, along with Cretan civilians, however, offered fierce resistance. Although Crete eventually fell, it is pointed out by historians that this, and the whole Greek campaign, delayed German plans significantly, with the result that the German invasion of the Soviet Union started fatally close to winter. During the years of Nazi occupation, hundreds of thousands of Greeks died in direct combat, in concentration camps, or of starvation. The occupiers murdered the greater part of the Jewish community despite efforts by the Greek Orthodox Church and many Christian Greeks to shelter Jews. The Greek economy languished. After liberation, Greece experienced an equally bitter Greek Civil War between the communist-led Democratic Army and the Hellenic Army that lasted until 1949, when the communists were defeated in the battle of Grammos-Vitsi. In the 1950s and 1960s, Greece continued to develop slowly with grants and loans through the Marshall Plan, and later through growth, notably in the tourism sector. In 1967, the Greek military seized power in a coup d'état and overthrew the conservative government of Panayiotis Kanellopoulos which had been preparing a general election set for May 28. The military established what became known as the Régime of the Colonels. In 1973, the régime abolished the Greek monarchy. In October 1973, George Papadopoulos appointed politician Spiros Markezinis as Prime Minister, with a mission undertake a transition to parliamentary democracy. Following the events of the Athens Polytechnic uprising, Papadopoulos and Markezinis were overthrown by a countercoup headed by junta hardliner Brigadier Ioannides on November 25, 1973. A new president, Phaedon Ghizikis, and a new Prime Minister, Adamantios Androutsopoulos, were appointed. Ioannides organised a military coup against President Makarios of Cyprus, which was considered a pretext for the first Turkish invasion of Cyprus in 1974 and the resulting crisis between Greece and Turkey. Escalation in Cyprus led to the implosion of the military régime. Ex-premier Konstantinos Karamanlis was invited from Paris as interim prime minister under President Ghizikis. He later gained re-election for two further terms at the head of the conservative Nea Dimokratia party, which he founded. In 1975, following a referendum to confirm the deposition of King Constantine II, a democratic republican constitution came into force. Another previously exiled politician, Andreas Papandreou also returned and founded the socialist PASOK party, which won the elections in 1981 and dominated the country's political course for almost two decades. Since the restoration of democracy, the stability and economic prosperity of Greece have grown. Greece joined the European Union in 1981 and adopted the Euro as its currency in 2001. New infrastructure, funds from the EU and growing revenues from tourism, shipping, services, light industry, and the telecommunications industry have greatly raised the standard of living in Greece. Tensions continue to exist between Greece and Turkey over Cyprus and the delimitation of borders in the Aegean Sea, but relations have thawed considerably following successive earthquakes - first in Turkey and then in Greece - and an outpouring of sympathy and generous assistance by ordinary Greeks and Turks. This is in stark contrast to decades of hostility between these two countries, which saw repeated threats of war. Even though both were members of NATO, at times more than half of the entire Greek military was positioned against Turkey. In recent years, Greece has become one of the chief advocates of Turkey's application to join the European Union. The 2004 Summer Olympic Games were held in Athens, returning to Greece for the first time since their modern inception in 1896. Despite widespread initial concerns over the city's ability to meet construction deadlines as well as over its ability to handle a potential terrorist threat, the Athens Games were widely praised as a success [http://news.bbc.co.uk/1/hi/world/europe/3610014.stm].

Politics

Main article: Politics of Greece The 1975 constitution includes extensive specific guarantees of civil liberties. The President of the Republic, elected by an increased majority of the Parliament for a term of five years, is nominally the Head of State. However, it is the prime minister and cabinet that play the central role in the political process, while the president performs very limited governmental functions, in addition to ceremonial duties. Greeks elect the 300 members of the country's unicameral parliament (the Vouli ton Ellinon) by secret ballot for a maximum of four years, but elections can occur at more frequent intervals. Greece uses a complex reinforced proportional representation electoral system which discourages splinter parties and ensures that the party which leads in the national vote will win a majority of seats. A party must receive 3% of the total national vote to gain representation. Greek parliamentary politics hinge upon the principle of the "dedilomeni", the "declared confidence" of Parliament to the Prime Minister and his/her administration. This means that the President of the Republic is bound to appoint as Prime Minister a person who will be approved by a majority of the Parilament's members (i.e. 151 votes). With the current electoral system, it is the leader of the party gaining a plurality of the votes in the Parliamentary elections who gets appointed Prime Minister. An administration may, at any time, seek a "vote of confidence"; conversely, a number of Members of Parilament may ask that a "vote of reproach" be taken. Both are rare occurrences with usually predictable outcomes as voting outside the party line happens very seldom. For a list of Greek political parties, see List of political parties in Greece.

Local government

Main article: Peripheries of Greece Peripheries of Greece Peripheries of Greece Peripheries of Greece Greece consists of 13 administrative regions known as peripheries, which subdivide further into the 51 prefectures (nomoi, singular - nomos):

- Attica:
- Attica
- Central Greece:
- Boeotia
- Euboea
- Evrytania
- Phocis
- Phthiotis
- Central Macedonia
- Chalcidice
- Imathia
- Kilkis
- Pella
- Pieria
- Serres
- Thessaloniki

- Crete
- Chania
- Heraklion
- Lasithi
- Rethymno
- East Macedonia and Thrace
- Drama
- Evros
- Kavala
- Rhodope
- Xanthi
- Epirus
- Arta
- Ioannina
- Preveza
- Thesprotia

- Ionian Islands
- Corfu
- Kefalonia
- Lefkada
- Zakynthos
- North Aegean
- Chios
- Lesbos
- Samos
- Peloponnese
- Arcadia
- Argolis
- Corinthia
- Laconia
- Messinia

- South Aegean
- Cyclades
- Dodecanese
- Thessaly
- Karditsa
- Larissa
- Magnesia
- Trikala
- West Greece
- Achaea
- Aetolia-Acarnania
- Elis
- West Macedonia
- Florina
- Grevena
- Kastoria
- Kozani

Beyond these one autonomous region exists: Mount Athos (Agio Oros - Holy Mountain), a monastic state under Greek sovereignty. The 51 nomoi subdivide into 147 eparchies (singular eparchia), which contain 1,033 municipalities and communities: 900 urban municipalities (demoi) and 133 rural communities (koinotetes). Before 1999, Greece's local government structure featured 5,775 local authorities: 457 demoi and 5,318 koinotetes, subdivided into 12,817 localities (oikosmoi).

Geography

Main article: Geography of Greece Geography of Greece Geography of Greece] Geography of Greece The country consists of a large mainland at the southern end of the Balkans; the Peloponnesus peninsula (separated from the mainland by the canal of the Isthmus of Corinth); and numerous islands (around 3,000), including Crete, Rhodes, Kos, Euboea and the Dodecanese and Cycladic groups of the Aegean Sea as well as the Ionian sea islands. Greece has more than 15,000 kilometres of coastline and a land boundary of 1,160 kilometres. About 80% of Greece consists of mountains or hills, thus making Greece one of the most montainous countries of Europe. Western Greece contains lakes and wetlands. Pindus, the central mountain range, has a maximum elevation of 2,636 m. The Pindus can be considered as a prolongation of the Dinaric Alps. The range continues by means of the Peloponnese, the islands of Kythera and Antikythera to find its final point in the island of Crete. (Actually the islands of the Aegean are peaks of underwater mountains that once consisted an extension of the mainland). The Central and Western Greece area contains high, steep peaks dissected by many canyons and other karstic landscapes, including the Meteora and the Vikos gorge the later being the second largest one on earth after the Grand Canyon in the US. Mount Olympus forms the highest point in Greece at 2,919 m above sea level. Also northern Greece presents another high range, the Rhodope, located in Eastern Macedonia and Thrace; this area is covered with vast and thick century old forests like the famous Dadia. Plains are mainly found in Eastern Thessaly, Central Macedonia and Thrace. Greece's climate is divided into three well defined classes the Mediterranean, Alpine and Temperate, the first one features mild, wet winters and hot, dry summers. Temperatures rarely reach extremes, although snowfalls do occur occasionally even in Athens, Cyclades or Crete during the winter. Alpine is found primarily in Western Greece (Epirus, Central Greece, Thessaly, Western Macedonia as well as central parts of Peloponessus like Achaea, Arkadia and parts of Lakonia where the Alpine range pass by). Finally the temperate climate is found in Central and Eastern Macedonia as well as in Thrace at places like Komotini, Xanthi and northern Evros; with cold, damp winters and hot, dry summers. It's worth to mention that Athens is located in a transition area between the Mediterranean and Alpine climate, thus finding that in its southern suburbs weather is of Mediterranean type while in the Northern suburbs of the Alpine type. About 50% of Greek land is covered by forests with a rich varied vegetation which spans from Alpine coniferous to mediterranean type vegetation. Seals, sea turtles and other rare marine life live in the seas around Greece, while Greece's forests provide a home to Western Europe's last brown bears and lynx as well as other species like Wolf, Roe Deer, Wild Goat, Fox and Wild Boar among others.

Economy

Main article: Economy of Greece Greece has a mixed capitalist economy with the public sector accounting for about half of GDP. Tourism has great importance, providing a large portion of GDP and foreign exchange earnings. Greece also counts as a world leader in shipping (first in terms of ownership of vessels and third by flag registration) [http://www.marad.dot.gov/MARAD_statistics/Country-MFW-7-04.pdf]. Greece figures prominently as a major beneficiary of EU aid, equal to about 2.4% of its GNP. The export of manufactured goods, including telecommunications hardware and software, foodstuffs, and fuels accounts for a large part of the rest of Greek income. The country has a high standard of living, ranking 24th on the 2005 Human Development Index and 22nd on The Economist's 2005 world-wide quality-of-life index[http://www.economist.com/media/pdf/QUALITY_OF_LIFE.pdf]. The economy has improved steadily over the last few years, as the government tightened fiscal policy in the run-up to Greece's entry into the Eurozone on January 1, 2001. Average per capita income in 2004 was estimated at $22,000 [http://www.worldbank.org/data/databytopic/GNIPC.pdf]. Greece has an expanding services sector and telecommunications industry and has become one of the largest investors in the immediate region. Moreover, Greece now operates as a net importer of labour and foreign workers (mainly from Eastern Europe, the Middle East, Pakistan, and Africa). People from these areas now account for 10% of the total population. 2001 Major challenges faced by the country include the reduction of unemployment, privatising of several state enterprises, social security reforms, overhauling the tax system, and minimising bureaucratic inefficiencies. Forecasts predicted economic growth of 4 - 4.5 % in 2004. Reducing the government deficit also remains a major issue, as it is currently running at nearly twice the Eurozone target of 3% of GDP. The new conservative government revealed to Eurostat that the previous figures supplied, which were the basis of Greek entry into the Eurozone, were incorrect. Under a negotiated agreement, the EU gave Greece two years (budgets of 2005 and 2006) to bring the economy in line with the criteria of the European stability pact. The Bank of Greece, now a subsidiary of the European Central Bank, functions as the nation's central bank. This bank is not the same as the "National Bank of Greece", a commercial bank.

Tourism

In the year of 2004, Greece ranked 12th interms of International tourist Arrivals world wide with a figure of 14.180 Million visitors, some of which came for the 2004 Olympic Games. Since the promotion of Greece from the Olympic Games, the Government expects significant growth in the years to come. In 2003, tourists spent an estimated 11 billion Euros contributing 8% to Greeces GDP. Tourism in Greece has multiplied 50 times in the past 40 years and is expected to only get bigger in the next 10 years. The main problem for Greece and its tourism industry is that many people are now going to places such as Turkey or Egypt were they can get a similar summer holiday for alot cheaper. Unfortunatly, the Government dosen't spend much on promoting tourism in Greece, although they have now hired Greek singer, Elena Paparizou, as there official Ambassador as well as having released a new campaign. One suggestion is to focus now on the Winter side of Greece as Greece's tourism industry is really only a 6 month tourism season. If promoted correctly, Greece could almost double its tourist statistics since most of the 14 million tourists are accounted for in only 6 months of a 12 month year.

Demographics

Main article: Demographics of Greece Greece has various linguistic and cultural minorities. A non-comprehensive list of these would include Pomaks and various Roma groups. A number of religious minorities exist, including the Muslim minority in western Thrace, which makes up about a third of that region's population. Around one million immigrants live full or part time in Greece today, of which 65% have come from Albania following the fall of communism in Albania. This was a very rapid phenomena and the Greek legal and social culture has had some difficulties adapting. Several prominent Greek sportsmen immigrated to Greece as ethnic Greeks from Albania and Georgia in the 1990s, including legendary weightlifters Pyrros Dimas and Kakhi Kakhiashvili. Smaller numbers of immigrants came from Bulgaria, Serbia, Romania. The exact number remains unknown, since the majority live illegally in Greece.

Religion

Prior to Ottoman rule, Greece was part of the Byzantine Empire. The civil and religious capital of the Empire was moved to Constantinople (modern day Istanbul) by Constantine I. Since Constantine’s time the Orthodox Christian faith has flourished and spread throughout Eastern Europe. Even under Turkish rule and repeated attempts at being proselytised firstly by the Jesuits and then by the Protestants, Orthodox Christianity survived and flourished. The role of the Orthodox Church in maintaining Greek ethnic and cultural identity during the 400 years of Ottoman rule, has strengthened the bond between religion and government. Most Greeks, even many non-practicing Christians, revere and respect the Orthodox Christian faith, attend Church and Major Feast days, and are emotionally attached to Orthodox Christianity as their 'national' religion. The Greek Constitution reflects this relationship by guaranteeing absolute freedom of religion while still defining the "prevailing religion" of Greece as the Eastern Orthodox Church of Christ. In practice, the Orthodox Church and the secular state are intimately involved with one another. Joint approval is needed for the building of churches and the Church has even blocked the building of places of worship for other religions in Athens. Priests receive state salaries. The President of the Republic takes an oath on the Bible and Orthodox Christianity is given privileged place in religious studies in primary education. The Church has also been allowed to keep its large portfolio of financial assets exempt from taxation and fiscal auditing. Starting in January 2005, a series of highly publicised corruption scandals involving high rank church officials have led to many calls by secular Greeks for the complete separation of Church and State and greater control of Church assets. The majority of Greeks (95-98%) have at least nominal membership in the Eastern Orthodox Church, although religious observance has declined in recent years. Greek Muslims make up about 1.3% of the population, and live primarily in Thrace. Greece also has some Roman Catholics, mainly in the city of Patras and the Cyclades islands of Syros, Paros,Tinos and Naxos; some Protestants and some Jews, mainly in Thessaloniki (which was once a major Jewish city until the Holocaust). Some groups in Greece have started an attempt to reconstruct Hellenic polytheism, the ancient Greek pagan religion. See also: Greek Orthodox Church. One small part of Greece, Mount Athos, is recognised by the Greek constitution as an autonomous monastic republic, although foreign relations, however, remain the prerogative of the Greek state. Spiritually, Mount Athos is under the Patriarchate of Constantinople and is therefore in communion with all the monasteries on Mount Athos and with the Orthodox Church based in various countries. One monastery has recently broken away and has formed a completely independent schism on the Holy Mountain -- Esphygmenou Monastery. Esphygmenou is composed of 117 Zealot monks who stubbornly oppose the head of the Church and do not commemorate him any more. They believe that they are the last remaining true Christians in the world and that Orthodoxy has been corrupted by having dialogue with other faiths. They also object to the lifting of the anathemas against the Roman Catholic Church in the 1960's by Patriarch Athenagoras. Jews have been present in Greece for the last 2000 years. The earliest reference to a Greek Jew is in an inscription, dated c. 300-250 BCE found in Oropos, a small coastal town between Athens and Boeotia, and refers to him as "Moschos, son of Moschion the Jew" who was in all likelihood, a slave. The first Greek Jewish population became known as the Romaniotes and their language became known as Yevanic (from the Hebrew word for Greece: יון/Yavan). From the 16th century onwards, Salonica, a city in northern Greece, had one of the largest (mostly Sephardic by then) Jewish communities in the world and a solid rabbinical tradition. On the island of Crete, the Jews played an important part in the transport trade. During World War II, when Greece was occupied by Nazi Germany, 86% of the Greek Jews were murdered by the invading Axis and only a minority survived and most of them have emigrated to Israel. Greece's Jewish community today is estimated at 4,500.

Culture

Main article: Culture of Greece Greece has produced a vast number of contributors to philosophy, astronomy, science, and the arts. For a list of famous Greek men and women, see List of Greeks. See also:
- Classics
- Education in Greece
- List of Greek dances
- List of museums in Greece
- Greek National Holidays
- List of research institutes in Greece
- Tourism in Greece
- List of universities in Greece

Miscellaneous topics

- History of Greece
- Ancient Greece
- Greek mythology
- Hellenistic civilization
- Byzantine Empire
- Byzantium
- Greek Language
- Communications in Greece
- List of Greek language television channels
- List of radio stations in Greece
- Greek newspapers
- Transportation in Greece
- List of Greek roads
- Rio-Antirio bridge
- Foreign relations of Greece
- Military of Greece
- Postage stamps and postal history of Greece
- Conscription in Greece
- Popular Greek Entertainment
- Plateia Syntagmatos and Vouli ton Ellinon
- Turkish Greek Civic Dialogue Project
- Greeks
- List of Greeks
- Greek American
- Category:Greek-Americans
- Greek Canadians
- Greek Australian

Sport in Greece

- Summer Olympics of 1896, 1906 & 2004
- Greece national football team (Euro 2004 Cup Winners)
- Greece national basketball team (Eurobasket 1987 & 2005 Cup Winners) The Greek government built a world class sport infrastructure specifically for the 2004 Summer Olympics which is generally regarded as a [http://www.athens2004.com/en/Legacy legacy]to the country. Greece was one of the smallest countries to ever host a modern summer Olympic games. The organisation and conduct of the games were considered highly successful. Unlike other western European countries, basketball has become a popular sport in Greece. This is largely the result of the victory achieved by the Greek national basketball team against the Soviet Union in the European championship final of 1987 held in Athens. Eighteen years later, Greece won its second Europen basketball championship in the 2005 Eurobasket, held in Belgrade.

External links

- [http://www.balkanforums.com Greece and the Balkans] Discussion Forum
- [http://www.go4less.gr/main.php?lang=EN Internet Travel Service to Greece and Smartest Accommodation Search Engine]
- [http://www.hri.org HR-Net (Hellenic Resources Network)/ comprehensive Greek news site]
- [http://www.statistics.gr/ Official Greek Statistics Site]
- [http://www.ask4greece.org Ask for Greece/ A volunteer community for Q&As about Greece]
- [http://www.gnto.gr/?langID=2/ Official Tourist Site]
- [http://www.greece-museums.com Greece Museums/ Museum directory of Greece]
- [http://www.athensvirtualtour.com/ Take a short virtual tour of Athens]
- [http://webcam.deili.info/en,1,8 Greece Webcam]
- [http://www.ert.gr/radio/liveradioTritovraxea.asp Radio Greece live]
- [http://greece.ianandwendy.com Photos of Greece from a backpacker's trip]
- [http://www.superbgreece.com Greece travel information]
- [http://www.phigita.net/ Greek Blogs and News]
- [http://dmoz.org/Regional/Europe/Greece/ Open Directory Project: Greece]
- [http://www.olympion.de/greek-embassies-worldwide.html A list of Greek Embassies Worldwide]
- [http://ozhanozturk.com/content/view/374/1/ History of Ottoman Greece]

Other official sites

- [http://www.presidency.gr/en/index.htm President of the Hellenic Republic]
- [http://www.greece.gr/index.htm Greece Now Government sponsored e-zine on Greek life]
- [http://www.primeminister.gr/gr/lang/en/primeminister.asp Prime Minister of Greece]
- [http://www.parliament.gr/english/default.asp Hellenic Parliament] Category:European Union member states roa-rup:Gârţii zh-min-nan:Hi-lia̍p ko:그리스 ms:Yunani ja:ギリシャ simple:Greece th:ประเทศกรีซ fiu-vro:Kriika

Solar system

The solar system comprises our Sun and the retinue of celestial objects gravitationally bound to it. Traditionally, this is said to consist of the Sun, nine planets and their 158 currently known moons; however, a large number of other objects, including asteroids, meteoroids, planetoids, comets, and interplanetary dust, orbit the Sun as well. Although the term "solar system" is frequently applied to other star systems and the planetary systems which may comprise them, it should strictly refer to our system specifically: the word "solar" is derived from the Sun's Latin name, Sol (and the term sometimes appears as Solar System). When talking about another stellar system (or planetary system), including the star(s) and bodies associated with them through gravity, it is usual to shorten it to "the system" (e.g. "the Alpha Centauri system" or "the 51 Pegasi system").

Structure and layout of the solar system

The Sun (astronomical symbol ☉) is a main sequence G2 star that contains 99.86% of the system's known mass. Its two largest orbiting bodies, Jupiter and Saturn, account for 91% of the remainder (The Oort Cloud might hold a substantial percentage, but as yet its existence is unconfirmed). In broad terms, the charted regions of our solar system consist of the Sun and its planetary system: the eight bodies in relatively unique orbits (commonly called planets or major planets) and two belts of smaller objects (which can be called minor planets, planetoids, meteoroids, planetesimals or, in the case of Pluto, planets). Objects in orbit round the Sun all lie within the same shallow plane, called the ecliptic, and all orbit in the same direction. Many are in turn orbited by moons, and the largest are encircled by planetary rings of dust and other particles. The major planets are, in order, Mercury (☿), Venus (♀), Earth (♁), Mars (♂), Jupiter (♃), Saturn (♄), Uranus (♅/10px), Neptune (♆), and Pluto (♇), though Pluto's status has been thrown into question by the discovery of (see below). Eight of the nine planets are named after or derived from gods and goddesses from Greco-Roman mythology; Earth, a Germanic word, is known in many Romance languages as Terra, the Roman goddess of the Earth. Distances within the solar system are measured most often in astronomical units, or AU. 1 AU is the distance between the Earth and the Sun, or 149 598 000 kilometers. Pluto is roughly 38 AU from the Sun, while Jupiter lies at roughly 5.2 AU. For very large distances within the solar system, such as regions beyond Pluto or the orbital circumferences of planets, the terameter (Tm, one milliard kilometers) is sometimes used. Despite the fact that many diagrams (like the image at the top of this article), for practicality's sake, represent the solar system as having each orbit the same distance apart, in actuality the orbits are largely arranged geometrically, that is, each is roughly double the distance from the Sun as the one before it. Venus’s distance from the Sun is roughly double that of Mercury, Earth’s distance is roughly double that of Venus, Mars’s double that of Earth and so on. This relationship is roughly expressed in the Titius-Bode law, a mathematical formula for predicting the semi-major axes of planets in AU. In its simplest form, it is written :

a= 0.4 + 0.3\times k

where k=0,1,2,4,8,16,32,64,128. By this formulation, we would expect Mercury's orbit (k=0) to be 0.4 AU, and Mars's orbit (k=4) to be at 1.6 AU. In fact their orbits are 0.38 and 1.52 AU.Ceres, the largest asteroid, lies at k=8. This law is only a rough guide, and doesn't fit all of the planets (Neptune is far closer than predicted, though Pluto lies at Neptune's predicted orbit). As of now, there is no scientific explanation for why this law "works," and many claim it is merely a coincidence. Pluto

Origin and evolution of the solar system

The current hypothesis of solar system formation is the nebular hypothesis, first proposed in 1755 by Immanuel Kant. It states the solar system was formed from a gaseous cloud called the solar nebula. It had a diameter of 100 AU and was 2-3 times the mass of the Sun. Over time, the nebula began to collapse, possiby due to disturbance by a nearby supernova. This explosion sent shock waves into space, which squeezed the nebula, pushing more and more matter inward until gravitational forces overcame its internal gas pressure and it also began to collapse. As the nebula collapsed, it decreased in size, which in turn caused it to spin faster to conserve angular momentum. And as the competing forces associated with gravity, gas pressure, magnetic fields, and rotation acted on it, the contracting nebula began to flatten into a spinning pancake shape with a bulge at the center. When the nebula further condensed, a protostar was formed in the middle. This system was heated by the friction of the rocks colliding into each other. Lighter elements such as hydrogen and helium evaporated out of the centre and migrated to the edges of the disc, thus concentrating the heavier elements to form dust and rocks in the centre. These heavier elements clumped together to form planetesimals and protoplanets. In the outer regions of this solar nebula, ice and volatile gases were able to survive, and as a result, the inner planets are rocky and the outer