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    Re: sextant index error measurement
    From: Jim Martin
    Date: 2006 Nov 04, 16:07 -0800

    Dear Bill,
    
    
     It still concerns me that although you have compensated for
    parallax,the effect of refraction when using the horizon would need to
    be considered.The comment that the tables allow for this,in my opinion
    applies only to the object.It seems to me that adjusting the sextant to
    the horizon would allow for this error.In the past I have adjusted my
    sextant to a nearby roof line and then taken it to the beach and found
    that the true and reflected horizons were not inline.
                                                Jim.
    
    .
    
    
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