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    Re: Direct methods
    From: Ronald van Riet
    Date: 2007 Nov 04, 01:13 -0700

    
    
    On Nov 3, 10:28 pm, "George Huxtable" 
    wrote:
    ....
    > Equations 7.5a to 7.5d take you to the latitude
    > of the crossing; indeed, the two latitudes, that you have to choose between,
    > for the two crossings. No analysis will choose for you which of those two
    > you are at
    
    For starters, if you don't have a rough idea where you are, you are a
    very poor navigator, so taking your dead reckoning position wil be
    sufficient for eliminating ambiguity.
    
    If you want a formal way of doing so, shoot a third star.
    
    IMHO there is no mathematical way to take away the ambiguity with just
    the two star observations, just as it is impossible to define a plane
    by just two points.
    
    Ronald
    
    
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