The geocentric model is a debunked theory that the Earth is the center of the universe, with the sun and planets revolving around it. When you purchase through links on our site, we may earn an ...

This article was originally published with the title “ How the Geocentric Model of the Universe Worked [Video] ” in Scientific American Magazine Vol. 310 No. 1 (January 2014) doi:10.1038 ...

Claudius Ptolemy was a Greek mathematician, astronomer and geographer who lived in the Egyptian city of Alexandria while under the rule of the Roman Empire. Much of medieval astronomy and ...

Melvyn Bragg and his guests discuss the last of the great Greek astronomers of antiquity, Ptolemy, and his influence on ancient and medieval astronomy. Show more Melvyn Bragg and his guests ...