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Primum Mobile :: Primum mobile () In the Ptolemaic system, the outermost of the revolving concentric spheres constituting the universe, the motion of which was supposed to carry with it all the inclosed spheres with their planets in a daily revolution from east to west. See Crystalline heavens, under Crystalline..

Eccentric :: Eccentric (n.) In the Ptolemaic system, the supposed circular orbit of a planet about the earth, but with the earth not in its center..

Trepidation :: Trepidation (n.) A libration of the starry sphere in the Ptolemaic system; a motion ascribed to the firmament, to account for certain small changes in the position of the ecliptic and of the stars..

Ptolemaic :: Ptolemaic (a.) Of or pertaining to Ptolemy, the geographer and astronomer..

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