天赤道(celestial equator)是天球上假像的一个大圈，位于地球赤道的正上方；也能够说是垂直于地球地轴把天球等分成南北两半的大圆，实践上有无限长的半径。
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... celestial sphere[天]天球(一个想像... celestial equator〈天〉天赤道... celestial longitude黄经 ...
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celestial equator system of coordinates 天赤道座标系统 ; 天文赤道坐标系 ; 天球赤道坐标系统
lunar celestial equator 月球天体赤道
equator celestial 天球赤道
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以上来源于: WordNet
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)
Either half of the celestial sphere as divided by the ecliptic, the celestial equator, or the horizon.
半天球被黄道，天赤道或地平圈分成两半的天球的一半…
Today is another Equinox + 1 day, with the Sun crossing the celestial equator yesterday at about 17:32 Universal Time.
今天是另一个春分+ 1天，昨天世界时17：32太阳运行经过天赤道。
As the Sun crosses the celestial equator heading south, spring begins in the southern hemisphere and autumn in the north.
当太阳在天赤道上掉头向南的时候，南半球的春天开始而北半球则是秋天。
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