geosphere 0.0.1

Spherical geometry utilities for navigation

This small pure python package provides two functions which do computations in spherical trigonometry that are needed for navigating on the surface of the earth.

The function

destination(lat_deg, long_deg, distance_nm, bearing_deg)

returns the latitude and longitude of the location reached by traveling distance_nm nautical miles along the great circle route starting at the location with latitude lat_deg and longitude long_deg and having the specified initial bearing.

The function

distance_bearing(lat1_deg, long1_deg, lat2_deg, long2_deg)

returns the distance in nautical miles and the bearing in degrees from the location given by the first latitude-longitude pair to the location given by the second latitude-longitude pair. If the points are too close together the bearing is 0. If the first point is at a pole, the bearing is 0 or 180, as appropriate. If the points are antipodes, so the bearing is undefined, then the bearing returned is 0.