Definition:Epicycle

Disambiguation

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Epicycle may refer to:

• 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

Also see

• Results about epicycles can be found here.

Linguistic Note

The adjectival form of epicycle is epicyclic.

Thus, an epicyclic gear is one where one gear wheel moves around another fixed one.