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    Re: Calibrating a sextant scale
    From: Dan Allen
    Date: 2007 Nov 25, 22:13 -0700

    On Nov 25, 2007, at 9:31 PM, frankreed{at}HistoricalAtlas.net wrote:
    > It does work. I've tried it in practice, and the results are
    > really excellent. The catch is that you need a location with a
    > fairly clear,
    > level horizon with a lot of well-defined points or vertical lines at
    > considerable distance. In the 18th century, a city on a level plain
    > with
    > numerous church steeples would fit the bill. Today, lighthouses or
    > other
    > navigational beacons around a relatively enclosed body of water work
    > just as
    > well.
    Frank: where did you do this?  Perhaps a few such locations could be
    given on the list so we could go try this out...
    PS - I see a new appendix in a future edition of Bowditch: a list of
    locations where sextant errors can be measured!
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