Ancient heliocentrists, Ptolemy, and the equant

Details Ancient heliocentrists, Ptolemy, and the equant Ancient heliocentrists, Ptolemy, and the equant

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987amjph..55..235r&link_type=abstract

American Journal of Physics, Volume 55, Issue 3, pp. 235-239 (1987).

Physics

3

History Of Science, Orbit Determination And Improvement

Scientific paper

Evidence is presented suggesting an ancient heliocentrist origin for geocentrist C. Ptolemy's planetary orbit elements and the equant. Pliny's data for Venus are shown to be inconsistent with geocentricity, and a heliocentric period-relation is found to be the basis of Ptolemy's previously unexplained and astonishingly accurate tables of the mean motion of Mars, the very planet whose orbit produced the equant. The admirable correctness of his adopted Mars elements is patently inconsistent with the ordmag 1° inaccuracy of Ptolemy's geocentric model and of his alleged empirical production.

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