... orbital angular momentum vector轨道角动量矢量 orbital ellipse轨道椭圆 orbital equation轨道方程 ...
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The main axis of the planet's orbital ellipse shifts each time when it goes around the sun.
当行星绕太阳运行时，其轨道椭圆的主轴每次都会改变。
The mainaxis of the planet's orbital ellipse shifts each time it goes round the sun.
这颗星球每围太阳绕行一周，它的椭圆形轨道的中轴就变化一次。
And then his third law was that if you take the orbital period of an ellipse, that is proportional to the third power of the mean distance to the Sun.
第三定律是，椭圆轨道的周期，和距太阳的平均，距离的，立方成比例。
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