deferent(redirected from Deferent and epicycle)
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deferent(def -ĕ-rĕnt) See Ptolemaic system.
an auxiliary circle in the Ptolemaic geocentric system of the world, introduced to explain the complex motions of planets. It was assumed that the center of the epicycle—another auxiliary circle—moves around the circumference of the deferent, at whose center lies the earth; the planet itself moves along the circumference of an epicycle.