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Aristarchus of Samos

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Aristarchus of Samos
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factoids
310 BC| birth_place = Samos
80}})AlexandriaHTTP://WWW.WORLDHISTORY.BIZ/ANCIENT-HISTORY/71176-ARISTARCHUS-OF-SAMOS.HTMLDATE=8 SEPTEMBER 2015ARCHIVEURL=HTTPS://WEB.ARCHIVE.ORG/WEB/20180507154131/HTTP://WWW.WORLDHISTORY.BIZ/ANCIENT-HISTORY/71176-ARISTARCHUS-OF-SAMOS.HTMLACCESSDATE=29 NOVEMBER 2018, | nationality = GreekScholar Astronomer}}}}Aristarchus of Samos ({{IPAc-en|ˌ|æ|r|ə|ˈ|s|t|ɑr|k|ə|s}}; , Aristarkhos ho Samios; c. 310 – c. 230 BC) was an ancient Greek astronomer and mathematician who presented the first known heliocentric model that placed the Sun at the center of the known universe with the Earth revolving around it. He was influenced by Philolaus of Croton, but Aristarchus identified the "central fire" with the Sun, and he put the other planets in their correct order of distance around the Sun.BOOK, John William Draper, Draper, John William, History of the Conflict Between Religion and Science, Joshi, S. T., 2007, 1874, The Agnostic Reader, 172–173, Prometheus, 978-1-59102-533-7, Like Anaxagoras before him, he suspected that the stars were just other bodies like the Sun, albeit further away from Earth. His astronomical ideas were often rejected in favor of the geocentric theories of Aristotle and Ptolemy. Nicolaus Copernicus attributed the heliocentric theory to Aristarchus.BOOK, George Kish, A Source Book in Geography,weblink 1978, Harvard University Press, 978-0-674-82270-2, 51,

Heliocentrism

{{see also|Heliocentrism}}The original text has been lost, but a reference in Archimedes' book The Sand Reckoner (Archimedis Syracusani Arenarius & Dimensio Circuli) describes a work by Aristarchus in which he advanced the heliocentric model as an alternative hypothesis to geocentrism:Aristarchus suspected the stars were other sunsWEB, solar-center.stanford.edu,weblink 2014-07-13, Louis Strous, Who discovered that the Sun was a star?, that are very far away, and that in consequence there was no observable parallax, that is, a movement of the stars relative to each other as the Earth moves around the Sun. Since stellar parallax is only detectable with telescopes, his accurate speculation was unprovable at the time.It is a common misconception that the heliocentric view was held as sacrilegious by the contemporaries of Aristarchus. Lucio Russo traces this to Gilles Ménage's printing of a passage from Plutarch's On the Apparent Face in the Orb of the Moon, in which Aristarchus jokes with Cleanthes, who is head of the Stoics, a sun worshipper, and opposed to heliocentrism.BOOK, Russo, Lucio, Lucio Russo, Levy, Silvio, The Forgotten Revolution: How Science Was Born in 300 BC and Why it Had to Be Reborn,weblink 13 June 2017, 2013-12-01, Springer Science & Business Media, 9783642189043, 82, fn.106, ; JOURNAL, Russo, Lucio, Silvio M., Medaglia, 1996, Sulla presunta accusa di empietà ad Aristarco di Samo, 20547344, Quaderni Urbinati di Cultura Classica, Fabrizio Serra Editore, New Series, Vol. 53, 2, 113–121, Italian, In the manuscript of Plutarch's text, Aristarchus says Cleanthes should be charged with impiety. Ménage's version, published shortly after the trials of Galileo and Giordano Bruno, transposes an accusative and nominative so that it is Aristarchus who is purported to be impious. The resulting misconception of an isolated and persecuted Aristarchus is still transmitted today.WEB,weblink De facie quae in orbe lunae apparet, Section 6, Plutarch, Perseus Digital Library, Tufts University, 13 June 2017, According to Plutarch, while Aristarchus postulated heliocentrism only as a hypothesis, Seleucus of Seleucia, a Hellenistic astronomer who lived a century after Aristarchus, maintained it as a definite opinion and gave a demonstration of itPlutarch, Platonicae quaestiones, VIII, i but no full record has been found. In his Naturalis Historia, Pliny the Elder later wondered whether errors in the predictions about the heavens could be attributed to a displacement of the Earth from its central position.BOOK, Neugebauer, O., Otto E. Neugebauer, A History of Ancient Mathematical Astronomy, 1975, 697–698, Springer-Verlag, Studies in the History of Mathematics and Physical Sciences, 1, PlinyNaturalis historia, II, 70 and SenecaNaturales quaestiones, VII, xxv, 6–7 referred to the retrograde motion of some planets as an apparent (and not real) phenomenon, which is an implication of heliocentrism rather than geocentrism. Still, no stellar parallax was observed, and Plato, Aristotle, and Ptolemy preferred the geocentric model, which was held as true throughout the Middle Ages.The heliocentric theory was revived by Copernicus,BOOK, Joseph A. Angelo, Encyclopedia of Space and Astronomy,weblink 14 May 2014, Infobase Publishing, 978-1-4381-1018-9, 153, after which Johannes Kepler described planetary motions with greater accuracy with his three laws. Isaac Newton later gave a theoretical explanation based on laws of gravitational attraction and dynamics.After realizing that the sun was much larger than the earth and the other planets, Aristarchus concluded that planets revolved around the sun. But this brilliant insight, it turned out, "was too much for the philosophers of the time to swallow and astronomy had to wait 2000 years more to find the right path."BOOK, Asimov, Isaac (1985). The Greeks: a great adventure. Boston: Houghton Mifflin., live,

Distance to the Sun (lunar dichotomy)

(File:Aristarchus working.jpg|thumb|right|260px|Aristarchus's 3rd-century BC calculations on the relative sizes of (from left) the Sun, Earth and Moon, from a 10th-century AD Greek copy)The only known surviving work usually attributed to Aristarchus, On the Sizes and Distances of the Sun and Moon, is based on a geocentric world view. It has historically been read as stating that the angle subtended by the Sun's diameter is two degrees, but Archimedes states in The Sand Reckoner that Aristarchus had a value of ½ degree, which is much closer to the actual average value of 32' or 0.53 degrees. The discrepancy may come from a misinterpretation of what unit of measure was meant by a certain Greek term in the text of Aristarchusweblink claimed that at half moon (first or last quarter moon), the angle between the Sun and Moon was 87°.Greek Mathematical Works, Loeb Classical Library, Harvard University, 1939–1941, edited by Ivor Thomas, volume 2 (1941), pages 6–7 He might have proposed 87° as a lower bound, since gauging the lunar terminator's deviation from linearity to one degree of accuracy is beyond the unaided human ocular limit (with that limit being about three degrees of accuracy). Aristarchus is known to have also studied light and vision.Heath, 1913, pp. 299–300; Thomas, 1942, pp. 2–3.Using correct geometry, but the insufficiently accurate 87° datum, Aristarchus concluded that the Sun was between 18 and 20 times farther away than the Moon.A video on reconstruction of Aristarchus' method, in Turkish language|Turkish] without subtitles.] (The true value of this angle is close to 89° 50', and the Sun's distance is actually about 400 times that of the Moon.) The implicit false solar parallax of slightly under three degrees was used by astronomers up to and including Tycho Brahe, c. AD 1600. Aristarchus 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; thus, the diameter of the Sun was calculated to be between 18 and 20 times the diameter of the Moon.BOOK, Kragh, Helge, Conceptions of cosmos: from myths to the accelerating universe: a history of cosmology, Oxford University Press, 2007, 26, 0-19-920916-2,

See also

Notes

{{reflist}}

References

  • BOOK, Heath, Sir Thomas, T.L. Heath, 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,weblink 1913, Oxford University Press, London, Reference-Heath-1913,

Further reading

External links

{{Ancient Greek astronomy}}{{Ancient Greek mathematics}}{{Authority control}}


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