feb 1, 150 - Ptolemy
Description:
Ptolemy, who was a mathematician, astronomer, geographer, astrologer, and poet, wrote his book called "Almagest". In his book, he introduced so called epicycles to explain planetary motions, based on the assumption that the earth is at the center of the solar system.Added to timeline:
Date:
feb 1, 150
Now
~ 1877 years ago