Hipparchus
Hipparchus was the first Greek whose quantitative and accurate models for the motion of the Sun and Moon survive. To do this, he used the observations and perhaps the mathematical techniques accumulated over centuries by the Chaldeans from Babylonia. He had a trigonometric table. It looks like he  solved some problems of spherical trigonometry with the table. With his solar and lunar theories and his trigonometry, he was perhaps the first to develop a reliable method to predict solar eclipses.  His other well-known achievements include the discovery of precession, and the compilation of the Hipparchus Catalog, the first comprehensive star catalog of the western world.