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Code Listing by Steve Ratts

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This function will compute the great circle distance between two points on a sphere of uniform radius using the Vincenty formula. At minimum, four inputs are required: lat1, long1, lat2, long2. Optionally, a fifth parameter (r) can be specified. If this parameter isn't specified it's assumed to be the mean radius of the earth in km.

INPUTS:
phi_s = latitude of the standpoint (base)
lambda_s = longitude of the standpoint...