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    Re: automatic celestial navigation
    From: Lu Abel
    Date: 2008 Jan 14, 20:55 -0800

    frankreed@HistoricalAtlas.net wrote:
    > An inertial system can be re-aligned by looking at the stars. Fundamentally,
    > this is nothing more than using the stars as a compass, to tell the
    > laser-gyros which way they're pointing after some drift has occurred.
    Somewhere in this discussion, it was pointed out that automatic
    celestial systems need a vertical reference and this is commonly
    provided by a gyro system.   So I need a celestial system to align my
    gyros and I need a gyro to align my celestial system???
    Lu Abel
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