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公转

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zhuàn(英语:Orbital revolution),是一物体以另一物体为中心,沿一定轨道所作的转动;所沿着的轨道可以为椭圆双曲线抛物线。在天文学上,一般用来形容行星彗星等星体环绕恒星卫星人造卫星等环绕行星;小规模星系星云宇宙尘埃等环绕大规模星系;以及更大规模的天体间环绕的运动。

在不同的参照系中,公转在不同的视角下,会出现两种公转方向。一种为逆时针方向,一种为顺时针方向。如下面的图所示,橙色球绕着图中心的红色球做公转运动,左边的是逆时针方向,右边的是顺时针方向。

公转运动示意图
逆时针方向公转 顺时针方向公转

参见

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公转
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