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    Re: Sextant parallax and index error determination
    From: Jim Martin
    Date: 2007 Nov 21, 14:40 -0800

    According to Nicholls's Concise Guide,sextant parallax becomes less
    than 1second of arc at a distance of 5nm.
                            Jim Martin.
    
    On Nov 21, 9:42 am, Greg Rudzinski  wrote:
    > Question for NAVLIST- Is the sextant parallax baseline measured from
    > the center of the scope to the center of the index mirror? How far
    > should the visible horizon be when used as a reference for determining
    > index error? Bowditch offers no explanation.
    >
    > Greg Rudzinski
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