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. In ancient Greece, astronomer and mathematician Claudius Ptolemy (A.D. 90–168) set up a model of the solar system in which the sun, stars, and other planets revolved around Earth.

Writes the study's author, "Both astronomers (Copernicus and Ibn al-Shatir) replaced Ptolemy's equant with additional circular motions, achieving uniform motion without an artificial reference point.

Studying a statue of Atlas holding the sky, an American astronomer finds key evidence of what could be a major fraud in science history. Ptolemy Tilted Off His Axis - Los Angeles Times ...

About 200 years later, the Egyptian polymath and author of the famous astronomy book Almagest, Claudius Ptolemy, refined the order of stars within these six levels.

Simplified reconstruction of Ptolemy's nine-ringed astronomical instrument called "Meteoroscope," as described in the hidden manuscript. It was a tool to calculate heights and distances, often in ...

A famous Greek astronomer and cartographer, Ptolemy's map of Ireland is incredibly accurate even though it was penned way back in 140AD. A map created by Greek astronomer and cartographer Claudius ...

Researchers have deciphered an ancient manuscript that they think Claudius Ptolemy, an Egyptian mathematician and astronomer of Greek descent, penned during the first century A.D. Written in Greek ...

Astronomy was of particular interest to Islamic scholars in Iran and Iraq and until this time around 800 AD, the only astronomical textbook was Ptolemy’s Almagest, written around 100 AD in Greece.

Sufi was a 10th century Persian astronomer who ran an observatory in Shiraz, Iran, where he studied the stars and the earlier works of Claudius Ptolemy, the first century Alexandrian Greek astronomer.