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.

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.

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 ...

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 ...

Ptolemy, who was born in 100 CE, was a renowned astronomer and mathematician who authored several important works, including Almagest and Geography.

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.

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 ...

By placing the sun at the center, Copernicus’s idea overturned the ideas devised by the second-century astronomer Ptolemy. In Ptolemy’s theory the sun and planets orbited the Earth, which was ...

The ancient Greek astronomer and geographer Ptolemy of Alexandria drew a map of the world in 140AD, which shows the stone fort, Grianan Aileach, as one of only five Irish sites to be noted in Ireland.

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 ...