Hipparchus. (n.d.). In YourDictionary. Retrieved from https://www.yourdictionary.com/hipparchus
also Hipparchos (hĭ-pärˌ◌kəs) bce 190?–120?
Greek astronomer who mapped the positions of about 850 stars in the earliest known star chart (129 ). His observations of the heavens formed the basis of Ptolemy's Earth-centered model of the universe. He was also a pioneer of trigonometry.
His geography was based more immediately on the work of his predecessor, Marinus of Tyre, and on that of Hipparchus, the follower and critic of Eratosthenes.
By a former marriage he already had two sons, Hippias and Hipparchus, now growing up, and in his first tyranny or his first exile he married an Argive, Timonassa, by whom he had two other sons Iophon and Hegesistratus, the latter of whom is said to be identical with Thessalus (Ath.
He was succeeded by his sons Hippias and Hipparchus, by whom the tyranny was in various ways brought into disrepute.
List of ostracized persons, the first of whom was a certain Hipparchus of the Peisistratid family (488 B.C.).
It is an extraordinary fact that, if ostracism was introduced in 598 B.C. for the purpose of expelling Hipparchus it was not till twenty years later that he was condemned.