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    Re: Simplified Bris Sextant
    From: Alexandre Eremenko
    Date: 2012 May 10, 13:57 -0400

    Greg,
    
    > Lens distortions and geometry are compensated for.
    
    I don't understand how.
    You cannot have a faithful picture of a piece of the sphere
    on the plane. This is a mathematical theorem.
    There is absolutely no way to measure the angles on celestial sphere
    by measuring the distances on a flat photograph.
    (I mean to have the same scale in all places of the picture).
    
    Alex.
    
    
    
    

       
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