mapado/haversine — pull request #1 by maurycyp (2013-07-19 23:27:33+00:00)
Title: Use more accurate values for Earth's radius and km/mi ratio

I realize that the haversine equation isn't very accurate, but improving these constants should help slightly.

Source: http://en.wikipedia.org/wiki/Earth_radius
Source: http://www.google.com/?q=1+km+in+mi