(c. 370—300 bc)

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Eudoxus of Cnidus (c. 400—350 bc)

Aristotle (384—322 bc)

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(c.370–c.300 bc)

Greek astronomer and mathematician. He modified Eudoxus' scheme of Earth-centred spheres, adding extra ones for the Sun, Moon, and some of the planets, bringing the total to 34. Callippus' model was further refined by Aristotle. Callippus calculated accurate lengths for the seasons, as measured between solstice and equinox.

Subjects: Astronomy and Astrophysics — Classical Studies.

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