Callippus
4th-century BC Greek astronomer and mathematician
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(Suggest an Edit or Addition)According to Wikipedia, Callippus was a Greek astronomer and mathematician. Biography Callippus was born at Cyzicus, and studied under Eudoxus of Cnidus at the Academy of Plato. He also worked with Aristotle at the Lyceum, which means that he was active in Athens prior to Aristotle's death in 322 BC. He observed the movements of the planets and attempted to use Eudoxus' scheme of connected spheres to account for their movements. However, he found that 27 spheres were insufficient to account for the planetary movements, and so he added seven more for a total of 34. According to the description in Aristotle's Metaphysics , he added two spheres for the Sun, two for the Moon, and one each for Mercury, Venus, and Mars.
