Precession, basically is the change in the direction of earth's axis of rotation.
岁差,基本上是地球自转轴方向的改变。
The axis of rotation and its support are part of the central pedestal.
旋转轴和它的支撑结构是中央操作台的一部分。
For the moment of inertia, we want the square of a distance to the axis of rotation.
至于转动惯量,要求的其实是到旋转轴距离的平方。
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