radius of ice sphere 冰球半径
radius of optical sphere 光学球面曲率半径的
radius of a sphere 球的半径
radius of escribed sphere 旁切球半径
radius of inscribed sphere 内切球半径
Let's assume that the atmosphere goes up 1000 km above the Earth (when it is a sphere), and so is a sphere itself of radius 6400km+1000km=7400km.
让我们做个假定，如果大气层高过“地球”（如果确是球体的情况下）1000公里的话，那么地球本身的半径6400公里+1000公里=7400公里。
So, for a sphere, the normal vector is divided by the radius of the sphere.
关于球体，法向量是,除以球的半径。
So, that's actually a great circle meridian of length, well, I mean, well, the radius is the radius of the sphere.
路程就是个大圆，我的意思是，这个圆的半径是球的半径。
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