deferent

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deferent

(def -ĕ-rĕnt) See Ptolemaic system.

Deferent

 

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.

deferent

[′def·ə·rənt]
(astronomy)
An imaginary circle around the earth, postulated by Ptolemy, in whose circumference a celestial body or its epicycle is supposed to move.