More recently, a manuscript once thought to be penned by Claudius Ptolemy, the renowned Egyptian mathematician and astronomer of Greek descent, has been deciphered. The ancient text, dating back ...

In astronomy, what does retrograde mean? And what connection does it have to astrology? We explain how planets move across ...

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 ...

Claudius Ptolemy (150 AD) map drawn from Ptolemy's coordinates for a 1482 edition of his Geographia (The Ulm Edition, Leinhard Holle) Lands beyond the bounds of the known world tantalized the ...