Distance between two Coordinates

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Point 1

Point 2

Distance between the two points

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Accuracy calculations

If you calculate the distance between (90, 0) and (-90, 0) you get 20015 km. If you divide this with PI (~3.41) then you get 6371 km.
According to wikipedia the globally-average earth radius value is usually considered to be 6371 km. So we have gotten the right result.