Copernican

En Biografia e Historia el 2009.01.19

Centuries before the Christian era, several Greek philosophers had proposed heliocentric models to coordinate the observed motions of the sun, moon, and planets in relation to the ?fixed? stars. However, the computational method of Alexandrian astronomer Claudius Ptolemy which he developed during the second century A.D. using a structure of equants and epicycles based on the earth as the only immovable point also made successful predictions of apparent motions. Although additional epicycles had to be...