In Ptolemy's geocentric model, the planet's motion along its deferent is all that is needed to understand retrograde motion.

Name: In Ptolemy's geocentric model, the planet's motion along its deferent is all that is needed to understand retrograde motion.
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In Ptolemy's geocentric model, both the deferent and an epicycle (a smaller circle on which a planet moves, whose center moves around the circumference of the deferent) are needed to explain the retrograde motion of the planets.

In Ptolemy's Geocentric Model, the Planet's Motion Along Its Deferent