In 1300 BC, the Egyptian star catalog contained 43 constellations. In ca. 1000 BC, the Egyptians put the solar calendar, which consisted of 12 30-day months with five extra festival days at the end of the year, into use. It required no astronomical adjustments or observations and became the standard used throughout the Middle Ages and used by Copernicus.

Babylonian Calendar, Calendar, Mayan Calendar