crystalline heaven

crystalline heaven
noun or crystalline sphere
: either of two transparent spheres imagined in the Ptolemaic system of astronomy to exist between the region of the fixed stars and the primum mobile in order to explain certain observed movements of the heavenly bodies

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crystalline heaven or crystalline sphere noun
In ancient astronomy, a sphere between the fixed stars and the primum mobile, assumed to explain precession of the equinoxes
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Main Entry:crystal

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crystalline heaven or crystalline sphere,
Astronomy. a sphere in the Ptolemaic system, supposed to exist between the primum mobile outside and the firmament of the fixed stars inside, and to communicate motion to all within.

Useful english dictionary. 2012.

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