Labels:text | screenshot | font | document OCR: c.146 BC Born in Nicaea, Bithynia (now Iznik in modern-day Turkey). He makes astronomical observations from Nicaea, the Greek island of Rhodes, and Alexandria in Egypt. 134 BC Notices a new star in the constellation of Scorpius and is inspired to make a star catalog, the first of its kind. 129 BC Completes the star catalog. (The stars are classified according to a system he devised and which is the basis for today's scale of apparent magnitude.) From observations of the star Spica in the constellation of Virgo he discovers the precession of the equinoxes (the apparent shifting of the stars over a 25,800-year period, caused by the Earth's movement about its axis). He calculates the year to be 365 days and 6 hours long (actually 365 days, 5 hours, 48 minutes, and 46 seconds), and the lunar p ...
