1、
The orbits of planets in the once popular geocentric Ptolemaic system are epitrochoids.
曾经盛行的托勒密地心说体系里的行星轨道就是外旋轮线.
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Accuracy of the measurements of the geocentric vector is affected by earth oblateness.
圆锥扫描式红外地球敏感器常用于测算地心矢量,而地球扁率影响地心矢量精度.
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