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    Re: 2-Body Fix -- take three
    From: George Huxtable
    Date: 2009 Nov 10, 08:37 -0000

    Andres Ruiz asked-
    
    I don't have John Karl�s book, and I am wondering if the method is the one
    by Gauss:
    
    http://www.fer3.com/arc/m2.aspx?i=030718&y=200606
    
    =================
    
    from George-
    
    Yes, that's exactly the method (which I didn't know, until now, was due to
    Gauss). His name crops up everywhere, doesn't it?
    
    In the notation of the equations quoted by Andres, B1 and B2 are the two
    ambiguous solutions for latitude, and only the navigator can decide which is
    the one where he is.
    To go with B1, there are two mathematical solutions for longitude, L11 and
    L12, only one of which is compatible with the two observed altitudes, and no
    judgment of the navigator is needed to decide which.
    
    Similarly, to go with B2, there are two longitudes L21 and L22, and a
    computer can choose between them.
    
    George.
    
    contact George Huxtable, at  george{at}hux.me.uk
    or at +44 1865 820222 (from UK, 01865 820222)
    or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    
    
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