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    Re: Spherical Law of Cosines
    From: Dan Allen
    Date: 2002 Oct 27, 08:23 -0800

    On Saturday, October 26, 2002, at 07:10 AM, Trevor J. Kenchington wrote:
    
    > I think it is true that sin(90-a)=cos(a), making this form
    > ofthe alternate identical to the canonical version. Of course, provided
    > one is careful over using (e.g.) latitudes rather than co-latitudes
    > with
    > the alternate, you could forget about explicitly subtracting anything
    > from 90. But remembering the alternate version as a solution to the
    > spherical triangle could get you into serious confusion.
    
    Good clarifications.  I agree.
    
    I just remember the canonical version and go from there.
    
    Dan
    
    
    

       
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