单词 | crystalline sphere |
释义 | crystalline spherenoun 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.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....
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