1. Home
  2. Education
  3. Ancient / Classical History

Ptolemy, Claudius

Claudius Ptolemy was one of the most influential Greek astronomers, geographers and mathematicians of all time, known best for his Almagest and Geography.

Latitude

Latitude

Longitude

Longitude

Ptolemy

From About's Geography Guide, an article on Ptolemy who is estimated to have lived from approximately A.D. 90-170, and worked in the library at Alexandria from 127 to 150. Ptolemy is known for Almagest, Tetrabiblos, and his Geography.

Who was Ptolemy? Claudius (Ptolemaues) Ptolemy

Site explains that the Almagest is divided into thirteen sections, and that Ptolemy, whose geocentric system was refuted in 1543, is the name given craters on Mars and a moon.

Explore Ancient / Classical History

About.com Special Features

Dinosaur Discoveries of the Decade

The top 10 fossil discoveries between 2000 and 2010. More >

How to Ace the GRE

Being well prepared is the first step; here are more essential suggestions. More >

  1. Home
  2. Education
  3. Ancient / Classical History
  4. People and Places
  5. People
  6. Mathematicians
  7. Claudius Ptolemy

©2009 About.com, a part of The New York Times Company.

All rights reserved.