Eudoxus of Cnidus was an ancient Greek astronomer, mathematician, doctor, and lawmaker. He was a student of Archytas and Plato. All of his original works are lost, though some fragments are preserved in Hipparchus's Commentaries on the Phenomena of Aratus and Eudoxus. Spherics by Theodosius of Bithynia may be based on a work by Eudoxus. 408 BC – 355 BC; died at about 52. Alive at the same time as Aristotle, Aristophanes, Thucydides, Apelles, and Plato. Wiki link