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    Re: Calibrating a sextant scale
    From: Mike L
    Date: 2007 Nov 20, 08:01 -0800

    > Then calibrate for index error as you already know. If any large errors
    > are found and corrected for you should repeat the last two steps.
    >
    > Nicol�s
    >
    >  cal_index_mirror.jpg
    > 49KViewDownload
    
    Nicol�s, thanks - I should have said that I had done the basic
    calibration as you suggested.
    
    The real question I was asking is having done the zero calibration,
    how would I check the error at other readings?
    
    ... the answer must be to take readings between two known stars (not
    risking life an limb off a cliff!) which I presume will be very
    accurate - but perhaps its not that simple because each will have some
    refraction through the atmosphere.
    
    Has anyone tried this?
    
    Mike
    
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