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Possible Duplicate:
How do I measure distance on a globe?

Say I have the coordinates of two locations. What formula could tell me the distance between the two? I'm not a math person at all, but I need a way of solving this.

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    I'm closing this as an exact duplicate. See especially the [answer by John Cook](http://math.stackexchange.com/questions/760/how-do-i-measure-distance-on-a-globe/826#826)2011-04-29

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