天球
From Wikipedia, the free encyclopedia
天球（英语：Celestial sphere），是拉天文学搭导航上想出个一个搭地球同圆心，并有相同个自转轴，半径无限大个球。天空中所有个物体侪可以当成投影拉天球上个物件。地球个赤道搭地理极点投射到天球上，就是天球赤道搭天极。
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