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ASTR 1P01, CLIP 56: Epicycles; Retrograde Motions in the Geocentric and Heliocentric Models
ASTR 1P01 CLIP 56B: Astronomy of the Renaissance Copernicus and the Heliocentric Hypothesis
ASTR 1P01, CLIP 55: Motions of the Planets; Prograde and Retrograde Motions
Ptolemaic Epicycles
Epicycles & Retrograde Motion
Geocentric and Heliocentric Models of Solar System
Teach Astronomy - Epicycles
Mars Retrograde and Epicycle Animation
Ch03C Heliocentric Model Retrograde Motion
Copernicus & Ptolemy Theories Compare & Contrast
Retrograde equant motion
Mars Heliocentric Retrograde the result is same
