Hipparchos

Hipparchos was a Greek astrologer, astronomer, geographer and mathematician of the Hellenistic period. He is well known for being the founder of trigonometry. Hipparchos was born in Nicea and probably died on the island of Rhodes. As far as it’s known, he was known to have been a working astronomer at least from 147 to 127 BC. He is considered the greatest ancient astronomical observer and, by some, the greatest overall astronomer of antiquity. He is also well known for being the first whose quantitative and accurate models for the motion of the Sun and Moon survive. With his solar and lunar theories and his trigonometry, he may have been the first to develop a reliable method to predict solar eclipses. His other reputed achievements include the discovery of Earth's precession, the compilation of the first comprehensive star catalog of the western world, and possibly the invention of the astrolabe also of the armillary sphere which he used during the creation of much of the star catalogue. He was a huge impact on astronomy.