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epicycle

A Dictionary of Astronomy | 1997 | Copyright

epicycle In the Ptolemaic system of planetary motion, a hypothetical small circle whose centre moved along the circumference of a bigger circle, the deferent (see diagram). Combinations of epicycles could be used to reproduce the observed motions of the planets, without abandoning the Greek dogma that only circular motions were allowable in the heavens.

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"epicycle." A Dictionary of Astronomy. 1997. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1O80-epicycle.html

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epicycle

The Concise Oxford Dictionary of English Etymology | 1996 | | Copyright

epicycle XIV. — (O)F. épicycle or late L. epicyclus — Gr. epíkuklos; see EPI-, CYCLE.

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T. F. HOAD. "epicycle." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>.

T. F. HOAD. "epicycle." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1O27-epicycle.html

T. F. HOAD. "epicycle." The Concise Oxford Dictionary of English Etymology. 1996. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O27-epicycle.html

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epicycle

The Columbia Encyclopedia, 6th ed. | 2011 | Copyright

epicycle see Ptolemaic system .

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"epicycle." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>.

"epicycle." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1E1-X-epicycle.html

"epicycle." The Columbia Encyclopedia, 6th ed.. 2011. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-X-epicycle.html

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