1) Circle
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https://www.crosswordclues.com/clue/epicycle
• (n.) A circle which rolls on the circumference of another circle, either externally or internally. • (n.) A circle, whose center moves round in the circumference of a greater circle; or a small circle, whose center, being fixed in the deferent of a planet, is carried along with the deferent, and yet, by its own peculiar motion, carries ...
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http://thinkexist.com/dictionary/meaning/epicycle/
(from the article `mechanics`) ...the Earth. This picture worked well enough for the stars but not for the planets. To `save the appearances` (fit the observations) an elaborate ... ...direction of motion occasionally but resume the dominant direction of motion after a while. To describe this variable motion, Ptolemy assumed t...
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http://www.britannica.com/eb/a-z/e/36
A small orbit within a larger orbit that was used (mistakenly) to describe the movements of celestial objects in the Ptolemaic system (about AD 150). In Ptolemy's model of the Solar System, the Sun, the Moon, or a planet moved in an epicycle, the center of which traveled along a bigger circular orbi...
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http://www.daviddarling.info/encyclopedia/E/epicycle.html
1. A circle, whose center moves round in the circumference of a greater circle; or a small circle, whose center, being fixed in the deferent of a planet, is carried along with the deferent, and yet, by its own peculiar motion, carries the body of the planet fastened to it round its proper center. 'The schoolmen were like astronomers which did feign...
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http://www.encyclo.co.uk/local/20973
Ep'i·cy`cle noun [ Latin
epicyclus , Greek ...;
'epi` upon + ... circle. See
Cycle .]
1. (Ptolemaic Astron.) A circle, whose center moves round in the circumference of a greater circle; or a small circle, whose center, being fixed in the deferent of a planet, is ...
Found on
http://www.encyclo.co.uk/webster/E/54
In the ancient astronomy, the epicycle was a small circle supposed to move round the circumference of a larger, a hypothetical mode of representing the apparent motion of the planets, which were supposed to have such a motion round the circumference of a large circle, called the deferent, having the earth in its centre.
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http://www.probertencyclopaedia.com/browse/AE.HTM
[
n] - a circle that rolls around (inside or outside) another circle
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http://www.webdictionary.co.uk/definition.php?query=epicycle
noun a circle that rolls around (inside or outside) another circle; generates an epicycloid or hypocycloid
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https://www.encyclo.co.uk/local/20974
a small circle the center of which moves around in the circumference of a larger circle: used in Ptolemaic astronomy to account for observed periodic irregularities in planetary motions. · a circle that rolls, externally or internally, without slipping, on another circle, generating an epicycloid or hypocycloid.
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https://www.infoplease.com/dictionary/epicycle
No exact match found.
