Claudius Ptolemy lived about 150 CE, and worked in Alexandria at the Museum. Like Eratosthenes, Ptolemy studied the Earth as well as the heavens. One of his major works was his Geography, one of the first realistic atlases of the known world. Ptolemy’s major work was his Mathematical Composition. His first major astronomical work, the Almagest, was completed about 150 ce and contains reports of astronomical observations that Ptolemy had made over the preceding.
Lecture on Claudius Ptolemy
