Born 190 BC Died 120 BC
-Hipparchus' many important and lasting contributions to astronomy included practical and well as theoretical innovations. He employed geometrical models, including the deferent-epicycle and eccentric previously used by Apollonius (flourished ca. 200 B.C.). One of his contributions appears to have been the incorporation of numerical data based on observations into the geometrical models developed to account for the astronomical motions
-http://www.hps.cam.ac.uk/starry/hipparchus.html
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