Hipparchus-
He was born in 190 BC and died in 120 BC. He is know for his commentary on the astronomical poem of Aratus, the Commentary on the Phainomena of Eudoxus and Aratus. He also contributed to the making of an astronomical calendar, books on optics and arithmetic, geographical and astrological writings, and a catalogue of his own work.
Along with writing, he employed geometrical models, including the deferent-epicycle and eccentric previously used by Apollonius . 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.
Sourcehttp://www.hps.cam.ac.uk/starry/hipparchus.html
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