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Sosigenes the Peripatetic (Greek: Σωσιγένης) was a philosopher living at the end of the 2nd century AD. He was the tutor of Alexander of Aphrodisias and wrote a work On Revolving Spheres, from which some important extracts have been preserved in Simplicius's commentary on Aristotle's De Caelo.
Sosigenes the Peripatetic (Σωσιγένης, Σωσιγένης ο Περιπατητικός) was a peripatetic philosopher living at the end of the 2nd century A.D. He was the tutor of Alexander of Aphrodisias and wrote a work on Revolving Spheres, from which some important extracts have been preserved in Simplicius's commentary on Aristotle's De caelo.

Work

Sosigenes criticized both Aristotle and Eudoxus for their imperfect theory of celestial spheres and also the use of epicycles, which he felt to be inconsistent with Aristotle's philosophical postulates. He pointed out that the planets varied markedly in brightness, and that eclipses of the Sun are sometimes total and sometimes annular, suggesting that the distances between the Sun, Moon and Earth were not the same at different eclipses.

Sosigenes is perhaps called "the Peripatetic" only because of his connection with Alexander. Some ancient evidence may be taken to suggest that he was, in fact, a Stoic. As John Patrick Lynch has written:

The other two teachers of Alexander may actually have been the philosophers whom ancient sources called Stoics; in both cases, Herminos/Sosigenes "the Stoic" have been distinguished from Herminos/Sosigenes "the Peripatetic" only on the grounds that the two latter men were teachers of Alexander of Aphrodisias. But it is not improbable that Alexander of Aphrodisias studied with two Stoic teachers and that these two pairs of homonymous contemporaries are actually only two Stoic philosophers.[1]

He is often confused with the astronomer Sosigenes of Alexandria, who advised Julius Caesar on the reform of the Roman calendar.

Notes

John Patrick Lynch, Aristotle's School: A Study of a Greek Educational Institution, Berkeley: University of California Press, 1972, p. 215.

References

Irby-Massie G., Keyser P., Greek Science of the Hellenistic Era: A Sourcebook, pages 80–81. Routledge.
Zhmud L., Chernoglazov A., (translator), The Origin of the History of Science in Classical Antiquity, page 231. Walter de Gruyter.
This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "Sosigenes". Encyclopædia Britannica (11th ed.). Cambridge University Press.

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Ancient Greek astronomy
Astronomers

Aglaonice Agrippa Anaximander Andronicus Apollonius Aratus Aristarchus Aristyllus Attalus Autolycus Bion Callippus Cleomedes Cleostratus Conon Eratosthenes Euctemon Eudoxus Geminus Heraclides Hicetas Hipparchus Hippocrates of Chios Hypsicles Menelaus Meton Oenopides Philip of Opus Philolaus Posidonius Ptolemy Pytheas Seleucus Sosigenes of Alexandria Sosigenes the Peripatetic Strabo Thales Theodosius Theon of Alexandria Theon of Smyrna Timocharis

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Almagest (Ptolemy) On Sizes and Distances (Hipparchus) On the Sizes and Distances (Aristarchus) On the Heavens (Aristotle)

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