Supplementary
Four nice movie clips from Mogi Vicentini illustrating planetary motion:
§ models from Eudoxus (homocentric spheres) to Apollonius/Hipparchus/Ptolemy (epicycles) to Copernicus (heliocentric)
§ a model showing how the eccentric and the equant approximates Kepler ellipse motion.
§ the geocentric – heliocentric views of the inner and outer planets.
Excerpts from the Almagest of Ptolemy’s introduction to the planetary theories.
The part of Ptolemy’s Planetary Hypotheses that explains his distance theory.