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    Re: Calibrating a sextant scale
    From: Fred Hebard
    Date: 2007 Dec 3, 10:44 -0500

    Just to reiterate, I think, these posts have to be three miles from
    the sextant or you account for parallax?
    On Dec 2, 2007, at 11:30 PM, frankreed@HistoricalAtlas.net wrote:
    > I've been thinking of other possibilities. Bays and sounds are the
    > best bet.
    > I wonder if there's a good spot in San Francisco Bay. I've also
    > wondered
    > about the possibility of observing from the top of a small hill in
    > relatively flat country, but if the objects are out of the horizon
    > by half a
    > degree or more, the error is too large. I did come up with another
    > possibility: how about a nice dry lake bed? There are plenty that
    > are flat
    > as a pancake for miles. Set up posts around the radius of a circle at
    > roughly equal angles, and voila, a sextant calibration observatory!
    > Do you
    > know if one would need special permission to go out onto the flats
    > west of
    > Great Salt Lake and drive posts into the ground? Or any of the So Cal
    > lakebeds?
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