Claudius Ptolemy

About 85 AD - Born in Egypt

AD 127-41

- made his astronomical observations from Egypt

- On March 26, 127, Ptolemy made his first observation and his last on February 141.

Claudius Ptolemy emerged as an influential astronomer and geographer.

The Greek scholar's most famous contribution was Almagest where he developed geometrical evidences explaining the motion of the sun along with the moon and the planets.

For 1,400 years, his contribution of geocentric theory was widely used as resource for astronomy until it was found out that he had a mistake in identifying the Earth as the center of the solar system instead of the sun.

Ptolemy also attempted to make a world map and even if it was more of inaccurate it still laid down the foundation of geography. He was certain that the earth had a spherical shape.

About 165 - Died in Alexandria, Egypt