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Aristarchus Of Samos:     more books (45)

3rd-Century Bc Writers: Archimedes, Epicurus, Aristarchus of Samos, Dicaearchus, Theophrastus, Conon of Samos, Philochorus, Menander Aristarchus of Samos : The Ancient Copernicus Aristarchus of Samos: An entry from Gale's <i>Science and Its Times</i> by Stephen D. Norton, 2001 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. A New Greek Text with Commentary and Translation by by ed. Aristarchus of Samos. Sir Thomas Heath, 1913 Solar System: Discovery and exploration of the Solar System, Planetary system, Star system, Aryabhata, Aristarchus of Samos, Nicolaus Copernicus, Kepler's ... Dwarf planet, Ceres (dwarf planet), Pluto, 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, by Thomas Little Heath, 1966 Aristarchus of Samos the Ancnt Copernicus. a History of Greek Astronomy to Arist Aristarchus of Samos. The Ancient Copernicus 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 A New Greek Text With Translation and Notes by Aristarchus of Samos; Sir Thomas Heath, 1997 Heliocentrism: Universe, Geocentric model, Nicolaus Copernicus, Johannes Kepler, Indian astronomy, Greek astronomy, Babylonian astronomy, Astronomy in ... Aristarchus of Samos, Seleucus of Seleucia ARISTARCHUS OF SAMOS by SIR THOMAS HEATH, 1913 Aristarchus of Samos: The Ancient Copernicus. History of Greek Astronomy to Aristarchus. by T.L. Heath, 1913-01-01 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 Aristarchus of Samos the Ancnt Copernicus. a History of Greek Astronomy to Arist by Sir Thomas Heath, 1997-01-01

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41. MSN Encarta - Aristarchus Of Samos
    aristarchus of samos (c. 310c. 250 bc), Greek astronomer. Find more about aristarchus of samos from Search Encarta for aristarchus of samos  
    http://uk.encarta.msn.com/encyclopedia_761568273/Aristarchus_of_Samos.html
    
    Extractions: Subscription Article MSN Encarta Premium: Get this article, plus 35,000 other articles, an interactive atlas, dictionaries, thesaurus, study centre, and more for £19.99/year. Learn more. The article is exclusively available for MSN Encarta Premium Subscribers. Already a subscriber? Sign in above. Aristarchus of Samos Aristarchus of Samos (c. 310-c. 250 bc ), Greek astronomer. He was the first to assert that the Earth revolves around the Sun, but his assertion is... Related Items Astronomy Cosmology 3 items Want more Encarta? Become a subscriber today and gain access to: Find more about Aristarchus of Samos from Related Items Other Features from Encarta Astronomy Cosmology Greek Literature Search Encarta for ... Aristarchus of Samos © 2005 Microsoft MSN Privacy Advertise Help

42. Aristarchus Of Samos - Columbia Encyclopedia® Article About Aristarchus Of Samo
    Columbia Encyclopedia® article about aristarchus of samos. aristarchus of samos. Information about aristarchus of samos in the Columbia Encyclopedia®.  
    http://columbia.thefreedictionary.com/Aristarchus of Samos
    
    Extractions: Feedback Aristarchus of Samos 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

43. Aristarchus Of Samothrace - Columbia Encyclopedia® Article About Aristarchus Of
    Aristarchus aristarchus of samos Aristarchus of Samothrace Aristide, JeanBertrand Aristides Aristides, Saint Aristippus Aristobulus aristocracy  
    http://columbia.thefreedictionary.com/Aristarchus of Samothrace

44. Aristarchus
    aristarchus of samos (ca. 310230 BC) and others proposed that the sun was A translation is aristarchus of samos proposed certain hypotheses in writing  
    http://www.du.edu/~etuttle/classics/aristarc.htm
    
    Extractions: 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

45. Bloomfield Science Museum, Jerusalem - Young Scientist - Scientists And Inventor
    aristarchus of samos, b. about 310 BC, d. about 230 BC, (Greek) aristarchus of samos (an Aegean island) in the early third century BC realised this and  
    http://www.mada.org.il/website/html/eng/2_1_1-29.htm
    
    Extractions: From ancient times, the "perfection" of the heavens was contrasted with the "chaos" of earth. The myriad stars moved across the sky in stately, unchanging order - marred only by the strange behaviour of the moon and five other heavenly bodies we now call the planets (the other planets are not visible to the naked eye). The strangest behaviour of all was that of "The Red Planet" - Mars - which not only moved across the field of stars at a variable speed but even on occasion reversed its direction ("retrograde motion"). Furthermore, its brightness varied by a large factor. The challenge was to reconcile these observations with the idea, universally held in ancient times, that the Earth was the centre of the Universe.

46. Aristarchus Of Samos
    aristarchus of samos. (c. 310230 BC),. Greek astronomer, first to maintain that the Earth rotates and revolves around the Sun.  
    http://www.omhros.gr/Kat/History/Greek/Sc/AristarchusSamos.htm
    
    Extractions: (c. 310-230 BC), Greek astronomer, first to maintain that the Earth rotates and revolves around the Sun. On this ground, Cleanthes the Stoic declared that he ought to be indicted for impiety. Aristarchus' advanced ideas on the movement of the Earth are known from Archimedes and Plutarch ; his only extant work is a short treatise, " On the Sizes and Distances of the Sun and Moon. " The values he obtained, by using geometry, are inaccurate, because of faulty observations. Aristarchus found a more precise value for the length of the solar year. A lunar crater is named for him; a peak in its centre is the brightest formation on the Moon. (C) 2000 Britannica.com Inc. Until the 16th century, most people (including early astronomers) considered Earth to be at the center of the universe. Greek philosopher Aristotle proposed a cosmology in about 350 bc that held for thousands of years. Aristotle theorized that the Sun, the Moon, and the planets all revolved around Earth on a set of celestial spheres. These celestial spheres were made of the quintessence—a perfect, unchanging, transparent element. According to Aristotle, the outermost sphere was made of the stars, which appear to be fixed in position. Early astronomers called the stars “fixed stars” to differentiate between stars and planets. The spheres inside the sphere of the fixed stars held the planets, which astronomers called the “wandering stars.” The Sun and Moon occupied the two innermost spheres. Four elements (earth, air, fire, and water) less pure than the quintessence made up everything below the innermost sphere of the moon.

47. Aristarchus -- Facts, Info, And Encyclopedia Article
    Cleanthes, a contemporary of Aristarchus thought it was the duty of the (A native or inhabitant of Greece) Greeks to indict aristarchus of samos on the  
    http://www.absoluteastronomy.com/encyclopedia/a/ar/aristarchus.htm
    
    Extractions: Aristarchus (310 BC - circa 230 BC) was a (A native or inhabitant of Greece) Greek (A physicist who studies astronomy) astronomer and (A person skilled in mathematics) mathematician , born in (Click link for more info and facts about Samos) Samos (A republic in southeastern Europe on the southern part of the Balkan peninsula; known for grapes and olives and olive oil) Greece . He is the first recorded person to propose a (Click link for more info and facts about heliocentric model) heliocentric model of the (The sun with the celestial bodies that revolve around it in its gravitational field) solar system , placing the (A typical star that is the source of light and heat for the planets in the solar system) Sun , not the (The 3rd planet from the sun; the planet on which we live) Earth , at the center of the known universe (hence he is sometimes known as the " (A native or inhabitant of Greece) Greek (A conspicuous crater on the moon) Copernicus "). His astronomical ideas were not well-received and were subordinated to those of

48. Samos
    aristarchus of samos, often referred to as the Copernicus of antiquity, laid the foundation for much scientific examination of the heavens.  
    http://www.polamjournal.com/Library/Biographies/samos/samos.html
    
    Extractions: 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."

49. Aristarchus Of Samos
    aristarchus of samosreadings from original texts.  
    http://www.russellcottrell.com/greek/aristarchus.htm
    
    Extractions: AND THE HELIOCENTRIC UNIVERSE Aristarchus of Samos ( ca. B.C. ), called "the mathematician" during his life, is the first person known to have proposed our modern view of the universe: that the Earth revolves around a fixed Sun. For some reason, however, Copernicus, who wrote 1700 years later and knew of Aristarchus' work, is the person most often credited with this heliocentric theory. Being far ahead of his time, like his younger contemporary Archimedes, his ideas never seem to have developed a following and so died out until the telescope revived them. Unfortunately, the original work in which Aristarchus proposes the theory has been lost; we know of it because Archimedes refers to it and describes Aristarchus' proposals. Unlike some ancient scholars, whose seemingly modern views were part of a larger system of mysticism and religion, Aristarchus was firmly grounded in observation and mathematics. The heliocentric theory is thought by some to have been a natural exension of his finding that the Sun is much larger than the Earth. His major extant work, On the Sizes and Distances of the Sun and Moon

50. AllRefer.com - Aristarchus Of Samos (Astronomy, Biography) - Encyclopedia
    AllRefer.com reference and encyclopedia resource provides complete information on aristarchus of samos, Astronomy, Biographies.  
    http://reference.allrefer.com/encyclopedia/A/AristarAst.html
    
    Extractions: By Alphabet : Encyclopedia A-Z A 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

51. Aristarchus Of Samos
    aristarchus of samos (Approximately 300 BC) discovered a method to figure out the ratio of the distances from the Earth to the sun, and Earth to moon.  
    http://share2.esd105.wednet.edu/jmcald/Aristarchus/main.html
    
    Extractions: Aristarchus of Samos (Approximately 300 BC) discovered a method to figure out the ratio of the distances from the Earth to the sun, and Earth to moon. Using several observations, which included the Half-Moon, Solar Eclipse, and Lunar Eclipse, he discovered a proportional relationship between the radius of the Earth and the radius of the moon. Another Greek Mathematician/Astronomer, Eratosthenes, (In the same time period) discovered a technique to find the radius of the Earth. Combining Aristarchus' work together with that of Eratosthenes, and using observations Aristarchus made about the apparent diameter of the moon, it is possible to calculate the sizes of the Earth, moon and sun, and also the distances between the Earth, moon, and sun. We'll show you how he set the equations for figuring out the distance from the Earth to the Sun, and from the Earth to the Moon. We will also, in plain English, explain that if of Eratosthenes and Archimedes worked with Aristarchus, Aristarchus would have been able to tell the distance from the Earth to the Sun, and the Earth to the Moon in around 300 BC. We will describe the arguments Aristarchus used to convince people about his theory and what he did wrong, what he did right, and how he intentionally lied, even though he knew the correct answer, to the people just to satisfy them.

52. Aristarchus And The Heliocentric Theory
    aristarchus of samos, the Copernicus of antiquity (310230 BC.) is credited by the Greek mathematician and inventor Archimedes to the hypothesis that the  
    http://share2.esd105.wednet.edu/jmcald/Aristarchus/history.html
    
    Extractions: History of Aristarchus of Samos Aristarchus of Samos, the "Copernicus of antiquity" (310-230 BC.) is credited by the Greek mathematician and inventor Archimedes to the hypothesis that the Sun, and not the Earth is the center of planetary motion. At the time, few people believed this hypothesis, though most believed the Earth rotated about its axis. These people rejected Aristarchus' hypothesis because they believed that the appearance of the fixed stars would change in different parts of the Earth's orbit, but Aristarchus thought that the distance of the fixed stars was so great this effect was unnoticeable. Aristarchus wrote a discourse, "On the sizes and distances of the Sun and the Moon." Through a series of observations he discovered the ratios of the Sun's and Moon's distances from the Earth, and the ratio of their sizes compared to the size of the Earth. With the help of Eratosthenes of Cyrene (276-195 BC.), we shall approximate the distances between the Earth, Sun, and Moon. Archimedes The Heliocentric Theory The Heliocentric Theory is often accredited to the Greek mathematician Copernicus, even though Aristarchus proposed this theory nearly 2000 years before. Copernicus believed that Ptolemy's theory wasn't accurate and he found it offensive. Heliocentric is derived from the Greek words, helio, meaning sun, and centric meaning center. The theory states that the Earth and all the other planets revolve around the sun.

53. Astrophotography By Anthony Ayiomamitis
    Greek Archaeoastronomy aristarchus of samos (310-230 BC). Although relatively little is known about aristarchus of samos, he is considered one of the  
    http://www.perseus.gr/Astro-Greek-Archae-Astr-Ari.htm
    
    Extractions: Although relatively little is known about Aristarchus of Samos, he is considered one of the greatest astronomers and mathematicians of the Alexandrian period. He is considered the father and founder of astronomy as a scientific discipline, for he attempted to employ scientific reason and logic in the understanding of the heavens in lieu of religious beliefs and doctrines in existence at the time. Aristarchus is best known for having put forth the heliocentric theory when describing the motion of the heavenly bodies whereby the planets orbit about a stationary sun in independent orbits. More specifically, Aristarchus proposed that the stars and sun are fixed in space wheres the planets, including earth, had their motion composed of two components comprised of a daily rotation about an axis and an annual rotation about the sun. Aristarchus emphasized that the sphere containing the stars was infinitely larger than the corresponding sphere which contained the orbit of the earth around the sun and, thus, the stationary nature of the stars in the sky could be explained. These revolutionary thoughts were instrumental in having Aristarchus accused of blasphemy (286 BC) and forced to flee to Alexandria in order to avoid the death penalty and where he taught at the Lyceum until his death. There are numerous direct and indirect references to Aristarchus' heliocentric theory including the writings of Archimedes who wrote:

54. Encyclopedia Of Astronomy And Astrophysics » Aristarchus Of Samos (310–230
    aristarchus of samos (310–230 BC). DOI 10.1888/0333750888/3439; Published November 2000. Icon Full text (PDF, 18K)  
    http://eaa.iop.org/index.cfm?action=summary&doc=eaa/3439@eaa-xml

55. Aristarchus - Definition Of Aristarchus In Encyclopedia
    Cleanthes, a contemporary of Aristarchus thought it was the duty of the Greeks to indict aristarchus of samos on the charge of aristarchus of samos  
    http://encyclopedia.laborlawtalk.com/Aristarchus
    
    Extractions: 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. Contents showTocToggle("show","hide") 1 Heliocentrism

56. Article About "Aristarchus" In The English Wikipedia On 24-Jul-2004
    thought it was the duty of the Greeks to indict aristarchus of samos on the External link. aristarchus of samos Biography JRASC, 75 (1981) 29  
    http://july.fixedreference.org/en/20040724/wikipedia/Aristarchus
    
    Extractions: The Aristarchus reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference : snapshots of Wikipedia from wikipedia.org) 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. Table of contents showTocToggle("show","hide") 1 Heliocentrism 3.1 External link 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

57. Astronomy Course: Lecture XIII
    Plutarch describes the cosmic system or starry system as conceived by aristarchus of samos, in these words In Aristarchus opinion the Universe is far,  
    http://www.awakenings.com/astronomy/l13.html
    
    Extractions: Lecture XIII My dear friends, In popular works, as you are well aware, the evolution of astronomical ideas is thus presented:- Until Copernicus, they say the Ptolemaic system was prevailing. Then through the work of Copernicus the system we accept - though with modifications - to this day, became the intellectual property of the civilised world. Now for the thoughts we shall pursue in the next few days it will be most important for us to be aware of a certain fact in this connection. I will present it simply by reading, to begin with, a passage from Plutarch. Plutarch describes the cosmic system or starry system as conceived by Aristarchus of Samos, in these words:- "In Aristarchus' opinion the Universe is far, far greater. He takes the stars and the Sun to be immobile, with the Earth moving around the Sun as centre. He then assumes that the sphere of the fixed stars, - its centre likewise in the Sun, - is so immense that the circumference of the circle, described by the Earth in her movement, is to the distance of the fixed stars as is the centre of a sphere to the surface thereof." This is the noteworthy fact. The heliocentric conception of the World is there in human thought, the Ptolemaic system supplants it, and in the Fifth post-Atlantean Epoch it is re-conquered. In all essentials we may aver that the Ptolemaic system held good for the Fourth post-Atlantean Epoch and for that alone. Not without reason do I bring this in today, after speaking yesterday of an 'ideal point' in the evolution of the Kingdoms of Nature. As we shall see in due course, there is an organic relationship between these diverse facts. But we must first enter more fully into the one adduced today.

58. Aristarchus Of Samos
    but it s the other Aristarchus, aristarchus of samos, who has been. In the Junior Woodchucks Guidebook, it s said that aristarchus of samos,  
    http://goofy313g.free.fr/calisota_online/exist/aristarchus.html
    
    Extractions: 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.

59. Aristarchus
    aristarchus of samos (310230 BC), was a astronomer often referred to as the Copernicus of antiquity, laid the foundation for much scientific examination of  
    http://www.angelfire.com/ca5/ancientgreecescience/aristarchus
    
    Extractions: Aristarchus of Samos (310-230 B.C.), was a astronomer 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, De revolutionibus caelestibus , 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.

60. Aristarchus Of Samos
    astronomy in questions and answers. Information on the sun, earth, moon, planets, solar system, meteors and comets, stars, constellations, galaxies,  
    http://www.astronomy.facts-on.com/scientists_and_astronomers/aristarchus.html
    
    Extractions: astronomy in questions and answers Site Search Scientists and astronomers [Question 5] 5. Who was Aristarchus? Aristarchus of Samos lived from 310 to 230 B.C. He was one of the first who used mathematics in astronomy. Only one of the writings of Aristarchus remains. Aristarchus pictured a heliocentric system which was many times larger than any that had been imagined before. In this system, the Sun and the stars were motionless, and the Earth and the other planets revolved about the Sun. He believed that the Sun was twenty times farther from the Earth than the Moon was. See also The Sun

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