21. Aristarchus Of Samos aristarchus of samos, ar istär kus, ar istär kus, sA mos PronunciationKey. Related content from HighBeam Research on aristarchus of samos. http://www.infoplease.com/ce5/CE002940.html

HOTWORDS CITE PRINT EMAIL in All Infoplease Almanacs Biographies Dictionary Encyclopedia Home Almanacs Atlas Dictionary ... D-Day Infoplease Tools Periodic Table Conversion Tool Perpetual Calendar Year by Year ... Site Map Also from Infoplease Search Infoplease Info search tips Search Biographies Bio search tips Encyclopedia Aristarchus of Samos u u s, s A Pronunciation Key Aristarchus of Samos , fl. c. 310 B.C. c. 230 B.C. , Greek astronomer and mathematician of the Alexandrian school. He is said to have been the first to propose a heliocentric or sun-centered theory of the universe. Of his writings only a treatise, The Sizes and Distances of the Sun and Moon, remains. The procedures he followed in this treatise were highly original; his calculation of the moon's distance was incorrect, but he derived a more correct value for the solar year. The treatise does not mention his conclusion that the earth moves around the sun and that the sun is at rest, but statements by Archimedes and Copernicus indicate that he held this theory. Other conclusions in which he seems to have anticipated later scientists are that the sun is larger than the earth, that the earth rotates upon its axis causing day and night, and that its axis is inclined to the plane of the ecliptic, causing the change of seasons. See T. L. Heath

22. Aristarchus Of Samos. The Columbia Encyclopedia, Sixth Edition. 2001 2001. aristarchus of samos. ( r´´ stär´k s, r´´ stär´k s, s ´m s)(KEY) , fl. 1. See TL Heath, aristarchus of samos (1913, repr. 1981). 2. http://www.bartleby.com/65/ar/AristarAst.html

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23. Aristarchus Of Samos aristarchus of samos Greek Astronomer and Philosopher -. His biography Aristarchuswas born around 320 before Jesus Christ on the Greek Island of Samos. http://goofy313g.free.fr/calisota_online/exist/aristarchus.html

Aristarchus of Samos - Greek Astronomer and Philosopher - * List of the stories he appears in : D 92380 The Guardians of the Lost Library ", from 1993, by Don Rosa. * His biography : Aristarchus was born around 320 before Jesus Christ on the Greek Island of Samos . He studied and lived in Alexandria A mathematician at least as much as an astronomer, he belonged to the so-called Pythagorean school of thought, which sought to understand the universe in terms of geometrical and arithmetical relationships. Aristarchus is known to have the first proponent of the heliocentric hypothesis, with the Earth ascribed a movement of orbital rotation about the Sun, as well as a daily axial rotation. Aristarchus argued that the lack of observed annual parallax in the fixed stars could be explained, within his heliocentric model, by assuming that the distance to the fixed stars is very much larger than the size of the Earth's orbit. This argument wasn't liked at all. The very same argument was to be made by Nicholas Copernicus , seventeen centuries later.

24. Aristarchus Of Samos (c.320-c.250 B.C.) aristarchus of samos (c.320c.250 BC) Leading astronomer of classical timeswho was the first to propose a heliocentric scheme for the solar system. http://www.daviddarling.info/encyclopedia/A/AristarchusSamos.html

The Encyclopedia of Astrobiology, Astronomy, and Spaceflight FRONT PAGE NEWS ARCHIVE NEWSLETTER ... Z this site WWW Aristarchus of Samos (c.320-c.250 B.C.) Leading astronomer of classical times who was the first to propose a heliocentric scheme for the solar system. He also devised a method for calculating the relative distance of the Moon and the Sun. See ancient philosophy, related to the possibility of extraterrestrial life For more: var site="s13space1234"

25. Detailed Record aristarchus of samos, the ancient Copernicus; a history of Greek astronomy to Aristarchus,together with Aristarchus s Treatise on the sizes and distances of http://worldcatlibraries.org/wcpa/ow/4fc92bd18fc4dd70.html

About WorldCat Help For Librarians Aristarchus of Samos, the ancient Copernicus; a history of Greek astronomy to Aristarchus, together with Aristarchus's Treatise on the sizes and distances of the sun and moon Thomas Little Heath, Sir Aristarchus, of Samos. Find libraries with the item Enter a postal code, state, province or country WorldCat is provided by OCLC Online Computer Library Center, Inc. on behalf of its member libraries.

26. ARISTARCHUS OF SAMOS. aristarchus of samos. One of the most distinguished astronomers of antiquitywas Aristarchus, who was born between 280 and 256 BC on Samos. http://hellas.teipir.gr/Thesis/Samos/english/tdk373.html

ARISTARCHUS OF SAMOS. One of the most distinguished astronomers of antiquity was Aristarchus, who was born between 280 and 256 B.C. on Samos. Aristarchus was the first to realise that the earth moved not only on its axis, but also round the sun. This theory, also to be found in Archimedes, consists in the idea that " the fixed stars and the sun remain motionless, while the earth revolves round the circumference of a circle, and in the middle of the circle is the sun .... ". Aristarchus made an attempt to measure the distance between the Earth and the Sun and the Moon, using in his calculation the angles of the triangle formed by the Earth, Moon and Sun, when the Moon is a half - moon. The basis of this calculation was, of course, correct, but things went wrong in its application. This method of mensuration held good for 18 centuries, until more modern scientists by the use of the approriate instruments were able to calculate the distance exactly. The conclusion of Aristarchus's investigation of the volume of the Moon was that this was equal to one - third of the volume of the Earth. The first instrument which Aristarchus used was a hollow hemisphere which had inside a gnomon which showed the projection of the shadow cast by the sun.

27. Aristarchus Aristarchus. aristarchus of samos (ca. 310230 BC) and others proposedthat the sun was motionless in the center of an infinitely http://www.du.edu/~etuttle/classics/aristarc.htm

Aristarchus Aristarchus of Samos (ca. 310-230 BC) and others proposed that the sun was motionless in the center of an infinitely large sphere of fixed stars, and that the earth revolved about it, as well as rotating about its axis. The story is told in Sir Thomas Heath's Greek Astronomy (1932, New York: Dover, republished 1991) and Aristarchus of Samos, the Greek Copernicus (1913). The lack of an adequate theory of motion and inertia caused the usual view of a fixed earth to prevail. The arguments are given by Ptolemy in the Syntaxis , demonstrating quite clearly that reason alone leads to error. Aristarchus also estimated the distances of the sun and moon from the earth. The measurements were not accurate enough to give a correct result, but did show that the sun was much more distant than the moon. Eratosthenes, somewhat later, estimated the radius of the earth, obtaining a value that happened to be accurate, although his estimate was thought too large (which encouraged Columbus). These accomplishments are of the greatest significance, as we can see from our perspective. No other science or religion in history came within miles of a similar understanding. Archimedes discusses Aristarchus in his Sand-Reckoner . A full account is given by Heath, but the Greek text of what he said Aristarchus did is shown here. It is in the Doric dialect, which is interesting, and Attic equivalents are given in square brackets for those unfamiliar with Doric peculiarities, the most common of which is the substitution of

28. Aristarchus Of Samos aristarchus of samos, ar istär kus, ar istär kus, sA mos Pronunciation Key. Aristarchusof Samos , fl. See TL Heath, aristarchus of samos (1913, repr. 1981). http://www.factmonster.com/cgi-bin/id/A0804698.hmtl

Encyclopedia Aristarchus of Samos u u s, s A Pronunciation Key Aristarchus of Samos , fl. c. 310 B.C. c. 230 B.C. , Greek astronomer and mathematician of the Alexandrian school. He is said to have been the first to propose a heliocentric or sun-centered theory of the universe. Of his writings only a treatise, The Sizes and Distances of the Sun and Moon, remains. The procedures he followed in this treatise were highly original; his calculation of the moon's distance was incorrect, but he derived a more correct value for the solar year. The treatise does not mention his conclusion that the earth moves around the sun and that the sun is at rest, but statements by Archimedes and Copernicus indicate that he held this theory. Other conclusions in which he seems to have anticipated later scientists are that the sun is larger than the earth, that the earth rotates upon its axis causing day and night, and that its axis is inclined to the plane of the ecliptic, causing the change of seasons. See T. L. Heath, Aristarchus of Samos (1913, repr. 1981).

29. Aristarchus Cleanthes, a contemporary of Aristarchus thought it was the duty of the Greeksto indict aristarchus of samos on the External link. aristarchus of samos. http://www.worldhistory.com/wiki/A/Aristarchus.htm

World History (home) Encyclopedia Index Localities Companies Surnames ... This Week in History Aristarchus 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. 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

30. Samos aristarchus of samos by Kristen Riley. aristarchus of samos, oftenreferred to as the Copernicus of antiquity, laid the foundation http://www.polamjournal.com/Library/Biographies/samos/samos.html

ARISTARCHUS OF SAMOS by Kristen Riley Aristarchus of Samos , often referred to as the Copernicus of antiquity, laid the foundation for much scientific examination of the heavens. According to his contemporary, Archimedes, Aristarchus was the first to propose not only a heliocentric universe, but one larger than any of the geocentric universes proposed by his predecessors. Copernicus himself originally gave credit to Aristarchus in his own heliocentric treatise, where he had written, "Philolaus believed in the mobility of the earth, and some even say that Aristarchus of Samos was of that opinion." Interestingly, this passage was crossed out shortly before publication, maybe because Copernicus decided his treatise would stand on its own merit. Plutarch in his De facie in orbe lunae gives reference not only to Aristarchus's theory, but to the way it was received by contemporaries. The general opinion of the time appeared to be that of Dercyllides, who "says that we must suppose the earth, the Hearth of the House of the Gods according to Plato, to remain fixed, and the planets with the whole embracing heaven to move, and rejects with abhorrence the view of those who have brought to rest the things which move and set in motion the things which by their nature and position are unmoved, such a supposition being contrary to the hypotheses of mathematics." As we can imagine, this did not look good for Aristarchus, and was probably one of the main reasons the heliocentric hypothesis did not re-emerge until the mid-15th century with the Copernican revolution.

31. AllRefer Encyclopedia - Aristarchus Of Samos (Astronomy, Biographies) - Encyclop AllRefer.com reference and encyclopedia resource provides completeinformation on aristarchus of samos, Astronomy, Biographies. http://reference.allrefer.com/encyclopedia/A/AristarAst.html

AllRefer Channels :: Health Yellow Pages Reference Weather SEARCH : in Reference May 31, 2004 You are here : AllRefer.com Reference Encyclopedia Astronomy, Biographies ... Aristarchus of Samos By Alphabet : Encyclopedia A-Z A Aristarchus of Samos, Astronomy, Biographies Related Category: Astronomy, Biographies Aristarchus of Samos u u s, s A Pronunciation Key , fl. c.310 B.C. B.C. , Greek astronomer and mathematician of the Alexandrian school. He is said to have been the first to propose a heliocentric or sun-centered theory of the universe. Of his writings only a treatise, The Sizes and Distances of the Sun and Moon, remains. The procedures he followed in this treatise were highly original; his calculation of the moon's distance was incorrect, but he derived a more correct value for the solar year. The treatise does not mention his conclusion that the earth moves around the sun and that the sun is at rest, but statements by Archimedes and Copernicus indicate that he held this theory. Other conclusions in which he seems to have anticipated later scientists are that the sun is larger than the earth, that the earth rotates upon its axis causing day and night, and that its axis is inclined to the plane of the ecliptic, causing the change of seasons. See T. L. Heath

32. TMTh:: ARISTARCHUS OF SAMOS ASTRONOMER. aristarchus of samos (fl. 320 250 BC) Life One of thegreatest of the theoretical astronomers of the ancient world. http://www.tmth.edu.gr/en/aet/2/16.html

Home Ancient Greek Scientists AGRICULTURALISTS ARCHITECTS ... PHYSICISTS ASTRONOMER ARISTARCHUS OF SAMOS (fl. 320 - 250 BC) Life One of the greatest of the theoretical astronomers of the ancient world. Aristarchus was born in Samos in 320 BC, studied with Straton of Lampsacus and lived in Alexandria (288-277 BC), where he made a series of astronomical observations. He was the chief exponent of the heliocentric system, as opposed to the geocentric system of Anaximander, the Pythagoreans, Philolaus, Plato and Archelaus. Archimedes refers to the heliocentric system of Aristarchus in his "Sand-Reckoner", as does Plutarch in "On the complaisance of philosophers". One of the craters on the moon has been named "Aristarchus" in his honour. Work Aristarchus taught that the earth revolves about its axis. He added 1/1623rd of a day to the solar year, estimated at 365 1/4 days by Callippus, and calculated the length of the Long Year (luni-solar cycle) at 2434 years. Up until the 16th century it was generally accepted that the earth was the centre of the universe. It was the Polish astronomer Copernicus (1473-1543) who once again introduced the idea of a heliocentric system, presenting the theory as his own although it was obvious that much of it was drawn directly from the work of Aristarchus. Scientists call Aristarchus "the Copernicus of antiquity" Principal works: "Heliocentric system": Lost. Considered by many of his contemporaries as "impious".

33. Works Of Aristarchus Of Samos Greek and Roman Literature HOME GREEK and ROMAN BABYLONIAN andEGYPTIAN aristarchus of samos (c. 310230). On The Sizes and http://www.brainfly.net/html/aristarc.htm

Greek and Roman Literature: HOME GREEK and ROMAN BABYLONIAN and EGYPTIAN Aristarchus of Samos (c. 310-230) On The Sizes and Distances of the Sun and Moon .........none.htm .......Disk 1

34. Online Encyclopedia - Aristarchus Cleanthes, a contemporary of Aristarchus thought it was the duty of the Greeksto indict aristarchus of samos on the External link. aristarchus of samos. http://www.yourencyclopedia.net/Aristarchus.html

Encyclopedia Entry for Aristarchus Dictionary Definition of Aristarchus 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. 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. Table of contents showTocToggle("show","hide") 1 Heliocentrism 2 Size of the Moon 3 Distance to the Sun 3.1 External link 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

35. Aristarchus Of Samos - Encyclopedia Article About Aristarchus Of Samos. Free Acc encyclopedia article about aristarchus of samos. aristarchus of samos in Freeonline English dictionary, thesaurus and encyclopedia. aristarchus of samos. http://encyclopedia.thefreedictionary.com/Aristarchus of Samos

Dictionaries: General Computing Medical Legal Encyclopedia Aristarchus of Samos Word: Word Starts with Ends with Definition Aristarchus 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 Battle of Lake Vadimo: The Romans defeat the Etruscans. Macedonian king Antigonus founded Antigonea, later known as Nicaea and Iznik (approximate year) 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 of Macedon Click the link for more information. - circa 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.

36. Aristarchus - Encyclopedia Article About Aristarchus. Free Access, No Registrati Cleanthes, a contemporary of Aristarchus thought it was the duty of the Greeksto indict aristarchus of samos on the charge of impiety for putting in motion http://encyclopedia.thefreedictionary.com/Aristarchus

Dictionaries: General Computing Medical Legal Encyclopedia Aristarchus Word: Word Starts with Ends with Definition Aristarchus 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 Battle of Lake Vadimo: The Romans defeat the Etruscans. Macedonian king Antigonus founded Antigonea, later known as Nicaea and Iznik (approximate year) 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 of Macedon Click the link for more information. - circa 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.

37. ASTR 228: Chapter 7 - Ptolemaic System Of The World All planets display noticeable variations in brightness over synodic period. 7.2.Hellenistic Period of Greek Science. aristarchus of samos (ca. 310 ca. http://www.physics.gmu.edu/classinfo/astr228/CourseNotes/ln_ch07.htm

Chapter 7. Ptolemaic System of the World Latest Modification: December 15, 1995 7.1. Babylonian and Egyptian Observations of Planetary Motion Observed motions of Sun, Moon, and five naked-eye planets, all wander among stars Sun and Moon move eastward on celestial sphere never changing their course; mostly uniform Inferior planets move eastward relative zodiac stars; then reverse moving westward ( retrograde motion Superior planets generally move eastward relative zodiac stars; brief period of retrograde motion westward near opposition All planets move through different angles in same interval of time over synodic periods; move swiftly some times and slowly at other times All planets display noticeable variations in brightness over synodic period 7.2. Hellenistic Period of Greek Science Aristarchus of Samos (ca. 310 - ca. 230 B.C.) Proposed Sun as center of planetary motion In treatise, On the Sizes and Distances of the Sun and Moon , he estimated that Sun is 20 times farther from Earth than Moon (closer to 400) Since both have approximately same angular size, the Sun must be 20 times larger than Moon or about 7 times Earth's diameter (closer to 109 times)

38. Psychology History Timeline aristarchus of samos (ca. 310 230 BC). Background aristarchus of samos wasa Greek astronomer and mathematician belonging to the Pythagorean school. http://psych.athabascau.ca/html/Glossary/demo_glossary.cgi?mode=history&term_id=

39. Athabasca University aristarchus of samos (ca. 310 230 BC). Background aristarchus of samos wasa Greek astronomer and mathematician belonging to the Pythagorean school. http://psych.athabascau.ca/html/Glossary/demo_glossary.cgi?term_id=679

40. Green Apple Books: Aristarchus Of Samos - The Ancient Copernicus: A History Of G Title aristarchus of samos the Ancient Copernicus a History of Greek Astronomyto Aristarchus Together With Aristarchus s Treatis Author Heath, Thomas http://www.greenapplebooks.com/cgi-bin/mergatroid/111267.html

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