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    Re: Direct methods
    From: Michael Dorl
    Date: 2007 Nov 04, 09:53 -0600

    
    Back in 1999, I sat down and worked out the spherical trig for this
    problem.  It may be found at
    
    http://ns.doit.wisc.edu/~mdorl/Sight%20Reduction%20write%20up.doc
    
    I am pretty sure it handles all the quadrant problems  I did not consider
    problems at angles when the trig functions misbehave.
    
    I've written a cpp program (SIGHTS) to solve this problem using this method
    and I have done some limited testing.  The program can be also found at
    http://ns.doit.wisc.edu/~mdorl/.  That copy is badly out of date; if anyone
    cares let me know and I'll upload the current version (hard for me because
    I live in the boonies beyond decent internet access.
    
    I haven't looked at but hope to get around to examining at the interesting
    planes solution.
    
    Mike
    
    
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