[Proj] Distance between pair of lat / lons

[Jayesh Chaudhary]

Folks,

We have been using GeoographicLib and it had a convenient function to
calculate distance between two points with an error in the range of nm. I
am familiar with PROJ4 but I don't see any such function in PROJ4. We do
care about accuracy and therefore I am not willing to use simple methods
that consider earth as perfect to compute such distance.

Please let me know if there is such functionality exists in PROJ4.

Thanks
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