celestial equator
柯林斯詞典
1. N the great circle lying on the celestial sphere the plane of which is perpendicular to the line joining the north and south celestial poles 天赤道 (Also called equinoctial, equinoctial circle)
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1. N the great circle lying on the celestial sphere the plane of which is perpendicular to the line joining the north and south celestial poles 天赤道 (Also called equinoctial, equinoctial circle)