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.
1603, John Florio, transl.; Michel de Montaigne, Essayes, printed at London: Edward Blount, OCLC 946730821:, Folio Society, 2006, vol.1, p.155:
- Is it not [Philosophie], that […] teacheth miserie, famine and sicknesse to laugh? Not by reason of some imaginarie Epicicles, but by naturall and palpable reasons.
- (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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