| 释义 |
celestial horizonn.（名词）- A great circle on the celestial sphere having a plane that passes through the center of the earth and is parallel to an observer's horizon. Also called rational horizon 天球地平圈：天球上的一个大圆，有一个通过地球的中心并与观察者的视野平行的平面 也作 rational horizon
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