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    Re: automatic celestial navigation
    From: Frank Reed
    Date: 2007 Dec 06, 14:11 -0500

    George H, you wrote:
    "If they have somehow succeeded in disentangling the "downward G force" from
    all the other accelerations that apply to a sextant in a vessel in waves on
    the sea, then there may be a future in it. But I doubt if they have. "
    There are devices which can measure the local tidal field (which can
    distinguish gravitational "down" from local accelerations, see, e.g.,
    http://www.bellgeo.com/tech/measurements.html), but the device mentioned
    earlier sounds like a relatively simpler electronic "level" built around a
    set of accelerometers. And of course, electronic levels, just like ancient
    fluid-based levels, detect the sum of the gravitational acceleration and the
    acceleration of the observer (relative to an inertial frame).
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