Hipparchus
/hɪˈpɑːkəs/- (c.170-after 126 BC) , Greek astronomer and geographer. He is best known for his discovery of the precession of the equinoxes and is credited with the invention of trigonometry.喜帕恰斯（约公元前170年-前126年之后, 希腊天文学家和地理学家, 最著名的成就是发现了岁差并被认为发明了三角学）。