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    Perpendicularity Error and the Davis Mk 3 Sextant
    From: Bob Goethe
    Date: 2017 Nov 12, 17:07 -0800

    I have a Davis Mark 3 sextant with a perpendicularity error.  Is this error likely to be consistent across a range of altitudes?

    The Mark 3 has adjustment screws to take out side error and index error, but you just have to live with whatever perpendicularity error you have.

    So then, if my sights are off by X minutes because of a perpendicularity error, is "X" likely to be the same whether I am shooting a celestial object at 15° or 55°?

    Or will this instrument irregularity introduce a different error at every possible altitude?

    Thanks,

    Bob

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