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    Re: celestial accuracy
    From: Bill Murdoch
    Date: 1999 Oct 30, 6:26 PM

    In a message dated 10/30/99 1:35:27 AM Eastern Standard Time,
    71202.2014@COMPUSERVE.COM writes:
    > I wonder how one goes about
    >  measuring dip at sea.  The only method that occurs to me is to set up
    >  a theodolite on shore, oil rig or other steady platform and measure
    >  the sea horizon with respect to the spirit bubble.
    Would a sextant-like instrument that could measure the angle between the
    horizon ahead and the horizon behind do the trick ?  Something you would look
    into and line up one horizon with the other.  Half the difference between the
    measured angle and 180 degrees would be the dip.
    Bill Murdoch

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