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Re: spherical geometry

As a side note, the airlines and mariners have long been interested in the
solution to this problem. And certain map projections have been designed to
facilitate the solution.

Joel R

| As part of your answer find a formula for the heading angle
| of the geodesic connecting 2 arbitrary fixed points (of known
| latitude and longitude) on the earth's surface as measured by
| an observer at one of those points.
| David Bowman