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。
The great-circle distance calculates the shortest distance between any two points on the surface of a sphere.
大圆弧长计算球面两点之间的最短距离。
The Haversine formula is used generally for computing great-circle distances between two pairs of coordinates on a sphere.
该矢公式用于计算之间的两对大圈的距离，一般在一个球体上的坐标。
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