Hipparchus

Part of speech: noun

Definitions

1. A prominent ancient Greek astronomer and mathematician known for his work in astronomy and for developing a system of star cataloging
2. An influential figure in the history of astronomy, recognized for his contributions to trigonometry and celestial navigation
3. A key historical scientist credited with introducing the concept of the precession of the equinoxes in his astronomical studies

Etymology: Hipparchus of Nicaea, the Greek astronomer and mathematician, is remembered mainly through his name, which comes from the ancient Greek "Hípparkhos," meaning "horse ruler" or "ruler of horses," formed from "hippos" (horse) and "arkhein" (to rule). The name was common in the Greek world, so the astronomer shares it with many other men of his time. Hipparchus is the figure through whom the name entered modern science. Astronomers and historians use it for him specifically, and it is the name by which his achievements, such as his star catalogue and his work on the positions of the sun and moon, are usually discussed. Because the name is tied so closely to one person, it is now rarely used for anyone else in English.