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 ...

Blame the Moon, and blame a man named Claudius Ptolemy. Around the year 150, the Roman Alexandrian scholar wrote a massive compendium of ancient math later (and famously) called the Almagest.

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 ...

Around the second century C.E., the Greek astronomer Claudius Ptolemy listed 48 "official" constellations in his book Almagest. No original copy of Almagest has survived, so we don't know how he ...

Now researchers have managed to recover the text written by Ptolemy on a parchment that suffered such a previous recovery attempt. Outermost six rings of the meteoroscope, not to scale.

One was the 1522 edition of the Geography of Claudius Ptolemy, the other a collection of historical narratives whose authors included Marco Polo and Christopher Columbus. It’s impossible to know ...