Distances & bearings between points, and destination points given start points & initial bearings,
calculated on an ellipsoidal earth model using ‘direct and inverse solutions of geodesics on the
ellipsoid’ devised by Thaddeus Vincenty.
From: T Vincenty, "Direct and Inverse Solutions of Geodesics on the Ellipsoid with application of
nested equations", Survey Review, vol XXIII no 176, 1975. www.ngs.noaa.gov/PUBS_LIB/inverse.pdf.
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