Definition:Epicycle


 * Ptolemaic astronomy:
 * Epicycle: the orbit described by a body moving in a uniform circular motion around a point which is itself moving in a uniform circular motion around another point


 * Analytic geometry:
 * Epicycle: the moving circle which rolls without slipping along a static curve such that a designated point on that epicycle generates a roulette.
 * Epicycle of Epicycloid
 * Epicycle of Hypocycloid