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    Accuracy of glass artificial horizon figure
    From: Paul Saffo
    Date: 2008 Aug 21, 08:47 -0700

    Does anyone know how accurate (i.e., level) the surface figure of a
    sheet of black glass must be to serve as an artificial horizon?  In
    particular I am trying to determine the point beyond which additional
    accuracy is irrelevant in terms of the result, given the other
    variables in a sighting with a hand-held sextant.
    best
    -p
    
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