Earth is the only one of the inner planets with a large satellite, the orbit of which is neither in the equatorial plane of Earth nor in the plane in which the other planets lie.

地球是内行星中唯一一个有大卫星的，它的轨道既不在地球的赤道平面上，也不在其他行星所在的平面上。

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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.

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。

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All geostationary satellites orbit the earth in the equatorial plane at a height of 35,785 km above the equator and stand still at a fixed azimuth and altitude for an observer on the earth surface.

所有的地球同步卫星都在赤道上空35,785 km高度运行，相对于地面观测者来说，它们的方位角和高度角是始终不变的。

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