一个天文单位等于地球轨道的平均半径，大约是93，000，000 英里。
One astronomical unit is equal to the average radius of the Earth's orBit, aBout 93, 000, 000 miles.
由静止卫星的轨道位置示意图可见，地球的平均半径约为6378公里，静止卫星的轨道高度约为35786公里，轨道半径约为42,164公里。
As shown, the earth's mean radius is about 6378 km, while the altitude and orbit radius of a GSO satellite is approximately equal to 35786 km and 42164 km respectively.
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