Definition from Wiktionary, the free dictionary
See also: épicycle
epicycle (plural epicycles)
- (astronomy) A small circle whose centre is on the circumference of a larger circle; in Ptolemaic astronomy it was seen as the basis of revolution of the "seven planets", given a fixed central Earth.
- (mathematics) Any circle whose circumference rolls around that of another circle, thus creating a hypocycloid or epicycloid.
a small circle whose centre is on the circumference of a larger circle
any circle whose circumference rolls around that of another circle
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