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crystalline sphere

Syllabification: crys·tal·line sphere

Definition of crystalline sphere in English:

noun

historical
(In ancient and medieval astronomy) a transparent sphere of the heavens postulated to lie between the fixed stars and the primum mobile and to account for the precession of the equinox and other motions.
Example sentences
  • In 1618, he observed three comets pass effortlessly through Ptolemy's crystalline spheres (in which the planets and stars supposedly moved around the Earth), showing that these spheres must be imaginary.
  • Peurbach believed that the planets were in solid crystalline spheres although he believed that their motions were controlled by the Sun.
  • Aristotle's view of the world was based on a spherical Earth round which there were crystalline spheres which carried the Sun, Moon and planets.

Definition of crystalline sphere in:

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