注：重量、转动惯量是按最大轴孔直径Y型孔计算的近似值。
Notes:Weight and rotary inertia are approximate value calculated by the greatest shaft-hole dia. of Y type hole.
本文给出了最大转动惯量轴与最小转动惯量轴相互垂直的证明。
In this paper, the axes of maximum and minimum moment of inertia is proved to be mutually perpendicular.
由于地球是扁球体，绕极轴惯量矩最大，而绕在赤道面内的轴的惯量矩最。
Because of its oblate shape, the moment of inertia of the earth is a maximum about the polar axis and minimum about an axis in the equatorial plane.
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