(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.
- 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.
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