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    Re: "Attainment of Precision" article (1964)
    From: Nicol�s de Hilster
    Date: 2009 Jul 08, 11:08 +0200

    frankreed{at}HistoricalAtlas.com wrote:
    > If you want a really good value for IC, shoot the Sun or the Moon 
    limb-to-limb ... it's usually more effective than the standard sea horizon 
    test (but the standard test is usually quite sufficient and it's the one that 
    should always be taught).
    >   
    could you please explain why the limb-to-limb method is more effective? 
    And can you explain how this is done? What I mean is: are you 
    superimposing opposite limbs onto each other (so calibrating the sextant 
    at the sun's/moon's diameter), or the same limbs (so calibrating for 
    zero at two spots in your field of view)? I take it it is the latter 
    method. Do you have any data supporting the effectiveness?
    
    Nicol�s
    
    
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