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    Re: An analytical solution of the two star sight problem of celestial navigation
    From: Bill Lionheart
    Date: 2019 Mar 5, 15:31 +0000

    Although if you took the two point equidistant map projection with the
    points the geographical position of then the probability contour would
    be an ellipse in those coordinates.
    
    Bill
    
    On Tue, 5 Mar 2019 at 14:03, Bill Lionheart  wrote:
    >
    > And the idea is quite simple. The circles of position from each sight
    > is the intersection of a plane with the sphere. The planes intersect
    > in a line, and it is easy to find the intersection points of a line
    > with a sphere. I dont know who was teh first to do this.  For bonus
    > points what is the probability contour in this case! (I don't know off
    > hand)
    >
    > Bill
    >
    > On Mon, 4 Mar 2019 at 15:03, Andrés Ruiz  wrote:
    > >
    > > As a curiosity the paper by James Van Allen: "An analytical solution of 
    the two star sight problem of celestial navigation" February 1981 at
    > > https://apps.dtic.mil/dtic/tr/fulltext/u2/a098626.pdf
    > >
    > > Published: IoN Vol. 28, No. 1, Spring 1981
    > >
    > > regards.
    > > --
    > > Andrés Ruiz
    > > Navigational Algorithms
    > > http://sites.google.com/site/navigationalalgorithms/
    > >
    > > View and reply to this message
    >
    > View and reply to this message
    

       
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