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crystalline heaven

noun
variants: or crystalline sphere

Definition of crystalline heaven 

: 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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First Known Use of crystalline heaven

15th century, in the meaning defined above

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The first known use of crystalline heaven was in the 15th century

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