出典:Wikipedia
出典:『Wikipedia』 (2011/07/13 04:29 UTC 版)
Hipparchus, or more correctly Hipparchos (Greek: Ἵππαρχος, Hipparkhos; c. 190 BC – c. 120 BC), was a Greek astrologer, astronomer, geographer, and mathematician of the Hellenistic period. He is considered the founder of trigonometry.