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 ...

It mentions the lunar model in which the Muslim astronomer used epicycles to correct Ptolemy's exaggerated lunar distance variations. "This is nearly identical to Copernicus's lunar model in De ...

The first great attempt to make mapping realistic came in the second century A.D. with Claudius Ptolemy. He was an astronomer and astrologer obsessed with making accurate horoscopes, which ...

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.

A reddish star is about to pass through a "beehive" of stars. That "star" is actually one of Earth's planetary neighbors.

In accord with the Greek ideals of symmetry and harmony, geographer and astronomer Claudius Ptolemy declared that a great northern landmass must be balanced by a twin in the Southern Hemisphere.

This so-called Geocentric model was the construction of famous Greek mathematician, astronomer Ptolemy. The model, though invaluable in helping to predict the positions of the stars and planets ...

helped overthrow more than a thousand years of Aristotelian thinking (reinforced by Greek astronomer Claudius Ptolemy) which said that objects only moved if an external force drove that motion.

Ptolemy was not the first classical author to describe Central Europe, and the territory of Bohemia, Moravia and Silesia in particular. The importance of his work is rather concerned with a list of ...

Did Copernicus borrow his cosmological theory from an earlier Muslim scientist? New research finds striking resemblance between Copernicus’s heliocentric treatise and a Muslim scientist’s cosmological ...