Definitions for "Hipparchus"
Greek astronomer and mathematician who discovered the precession of the equinoxes and made the first known star chart and is said to have invented trigonometry (second century BC)
Greek astronomer living around 500 BC. Invented the system of magnitudes upon which we now measure brightness and made the first advances in astrometry (measuring astronomical dimensions).
Son of Pisistratus who was assassinated by Harmodius and Aristogeton. Possibly joint tyrant with Hippias
Hipparchus is the degraded remnant of a lunar crater. It is located to the southeast of Sinus Medii, near the center of the visible Moon. To the south is the prominent Albategnius crater, and to the southwest lies Ptolemaeus crater, a feature of comparable dimensions to Hipparchus.