在秋分那天，地球赤道面正与黄道（或者说绕太阳运行的地球轨道面）水平相遇。
And on the day of the equinox, the plane of Earth's equator is intersecting the ecliptic – or plane of Earth's orbit around the sun.
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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