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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“Crystalline heaven.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/crystalline%20heaven. Accessed 25 Sep. 2021.
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Time Traveler for crystalline heaven
The first known use of crystalline heaven was in the 15th century
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