Birthdate: 0190 BC

Birthplace: Nicaea, Kingdom of Bithynia

Died: 0120 BC

In his early years in Bithynia, Hipparchus spent most of his time compiling weather records. He devoted almost his entire life to astronomical research. Remembered as the man who founded trigonometry, he also discovered the precession of the equinoxes. However, most of his written work hasn’t survived.