Peripatetic school used by earlier philosophers such as Socrates. Aristotle and his colleagues first began to use the Lyceum in this way about 335 BC, after which Aristotle left Plato's Academy and Athens, and then returned to Athens from his travels about a dozen years later. Because of the school's association with the gymnasium, the school also came to be referred to simply as the Lyceum. Some modern scholars argue that the school did not become formally institutionalized until Theophrastus took it over, at which time there was private property associated with the school. Originally at least, the Peripatetic gatherings were probably
Sosigenes the Peripatetic Sosigenes the Peripatetic Sosigenes the Peripatetic () 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 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,