retrograde motion

Home » retrograde motion

Ptolemy – Roman astronomy – history of science

By |2018-04-11T09:22:19+00:00September 4th, 2017|Romans, Science|

A copy of Ptolemy's map of the world Ptolemy was born in Egypt in about 90 AD, when the Romans were ruling Egypt. He was a Roman citizen. Probably he was the son or grandson of a Roman government slave - maybe a clerk - who was freed and got citizenship. As a boy, Ptolemy went to Greek schools in Alexandria and wrote in Greek. When [...]

Medieval astronomy in Europe

By |2018-04-24T08:21:21+00:00August 4th, 2017|Medieval, Science|

Astrolabe in Hebrew, probably from Spain (1300s AD) In the early Middle Ages, most people in Europe were too poor to have much time for astronomy. But some people were still interested in the stars. Astrologers tried to predict the future. Monks wanted to figure out the right day to celebrate Easter, or the right times for prayers. And a few [...]