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Heraclides Ponticus
Heraclides Ponticus (; c. 390 BC – c. 310 BC〔Tiziano Dorandi, ''Chapter 2: Chronology'', in Algra et al. (1999) ''The Cambridge History of Hellenistic Philosophy'', page 48. Cambridge.〕), also known as Herakleides and Heraklides of Pontus, was a Greek philosopher and astronomer who lived and died at Heraclea Pontica, now Karadeniz Ereğli, Turkey. He is best remembered for proposing that the earth rotates on its axis, from west to east, once every 24 hours.〔"Heraklides of Ponticus," The Hutchinson Dictionary of Scientific Biography〕 He is also frequently hailed as the originator of the heliocentric theory, although this is doubted.
==Life==
Heraclides' father was Euthyphron, a wealthy nobleman who sent him to study at the Platonic Academy in Athens under its founder Plato and under his successor Speusippus. According to ''Suda'', Plato, on his departure for Sicily in 361/360 BC, left the Academy in the charge of Heraclides. Heraclides was nearly elected successor to Speusippus as head of the academy in 339/338 BC, but narrowly lost to Xenocrates.
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