Is there a simgear or plib function that I can use to get the angle between
two locations?  Namely the angle of direction from eye (lon, lat, alt) to
aircraft (target_lon, target_lat, target_alt).  For example in our current
"chase view" the angle would be the "heading" since we are always following
the plane.  In tower view I need to calculate the angle to the plane (which
actually will be the way all lookat views work when I am done).



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