For the purposes of this article, I will demonstrate distances using the flat-Earth model and the great-circle distance and leave the rest to you to explore.
但是为了实现本文的目的，我将使用平面地球模型和大圆弧长距离来演示距离，其他方法留给读者探索。
In other cases, a spherical model is used, and the primary distance calculation used is the great-circle distance (see Resources).
在其他情况下使用球面模型，所使用的主要距离计算为大圆弧长(参见参考资料)。
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。
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