Encyclopedia article about the Greek astronomer Hipparchus that contains information about his life and work. Also includes a lengthy list of references and links to additional information near the bottom of the page.

A biography on Ptolemy, a Greek astronomer, discusses his two most famous works, "Almagest" and "Geographia." Other books he wrote are also listed.

This site, which is provided for by the University of St. Andrews, gives a biography of the Greek astronomer and mathematician who supported the theory of geocentricism.