Callippus of cyzicus biography of martin luther

Biography

The dates given for the birth and death of Callippus of Cyzicus are guesses but he is known to have been working with Aristotle in Athens starting in BC.

We know that Callippus was a student in the School of Eudoxus. We also know that he made his astronomical observations on the shores of the Hellespont, which can be deduced from the observations themselves.

Callippus of cyzicus biography of martin luther king

Simplicius writes in his commentary on De caelo by Aristotle(see for example [1]):-

Callippus of Cyzicus, having studied with Polemarchus, Eudoxus's pupil, following him to Athens dwelt with Aristotle, correcting and completing, with Aristotle's help, the discoveries of Eudoxus.

Callippus made accurate determinations of the lengths of the seasons and constructed a 76 year cycle comprising months to harmonise the solar and lunar years which was adopted in BC and used by all later astronomers.

This calendar of Callippus is examined in detail by van der Waerden in [6]. Ptolemy gave us an ac