英语词汇“hour circle”是什么意思，“hour circle”的读音、用法及例句翻译-烛光网

词汇	hour circle
释义	hour circlen.（名词） A great circle passing through the poles of the celestial sphere and intersecting the celestial equator at right angles.子午线：通过天体球两极，与天体赤道成直角相切的大圈
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