(c. 190 BCE – c. 120 BCE)
Greek astronomer, geographer, and mathematician of the Hellenistic period, considered the founder of trigonometry; famous for his discovery of precession of the equinoxes



Works by this author published before January 1, 1925 are in the public domain worldwide because the author died at least 100 years ago. Translations or editions published later may be copyrighted. Posthumous works may be copyrighted based on how long they have been published in certain countries and areas.