Sosigenes the Peripatetic

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Sosigenes the Peripatetic was a 2nd century Aristotelian philosopher ( Peripatetic ).

Sosigenes is mentioned in connection with the " saving of phenomena ", that is to say with the question of how one can ultimately trace back the complicated movements of the celestial bodies, especially the sun, moon and planets, to the combination of ideal, uniform circular movements around a center. On September 4, 164, he is said to have observed an annular solar eclipse and concluded from the difference to a total solar eclipse that the apparent size of the sun or moon changes and thus they cannot orbit a common center (the earth), but that these Celestial bodies should each have their own centers. This made him a stimulus for Nicolaus Copernicus in developing his heliocentric system . One of his students was Alexander of Aphrodisias .

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