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1.(astronomy) the angular distance of a celestial point measured westward along the celestial equator from the zenith crossing; the right ascension for an observer at a particular location and time of day.
(天文学)从天顶交叉口向西顺着天赤道测量的一个角距离;对在一个特定的地点和特定的时间观测者来说是赤经。收藏指正
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