Document Type
Article
Publication Date
12-1984
Publication Title
American Journal Of Physics
Department
Science, Technology and Society
Abstract
We examine the roles of the equant and eccentric deferent circles on Ptolemy’s planetary theory. The necessity of these features of the model is demonstrated empirically by a study of the retrograde arcs of Mars. Finally, these results are used, together with available historical evidence, to suggest the line of investigation that probably led Ptolemy to his discovery of the equant.
Volume
52
Issue
12
pp.
1080-1089
ISSN
0002-9505
WorldCat Link
Citation
Evans, James C.. 1984. "On the function and the probable origin of Ptolemy's equant." American Journal Of Physics 52(12): 1080-1089.