单词 | Ptolemaic system |
释义 | Word Frequency Ptolemaic systemnoun the theory of planetary motion developed by Ptolemy from the hypotheses of earlier philosophers, stating that the earth lay at the centre of the universe with the sun, the moon, and the known planets revolving around it in complicated orbits. Beyond the largest of these orbits lay a sphere of fixed stars See also epicycle (sense 1), Compare Copernican system |
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