单词 | Ptolemaic system |
释义 | Ptolemaic system [¦täl·ǝ¦mā·ik `sis·tǝm] ASTRONOMY The movements of the solar system according to Ptolemy; supposedly, the earth was a fixed center, with the sun and moon revolving about it in circular orbits; planets revolved in small circles (epicycles) whose centers revolved about the earth in larger circles (deferents). |
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