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    Re: The development of bubble sextants
    From: Douglas Denny
    Date: 2009 Aug 15, 02:43 -0700

    Dear Gary,
    Coriolis is a very real acceleration. It is not fictional at all.
    The sextant (and person ) is being carried through space in a curved motion by 
    the Earth itself, and the acceleration due to curved motion is real enough, 
    just the same as if you are in the big Millenium Ferris Wheel in London, or 
    in a fairground 'Skyboat' device whizzing around in circular motion.
    Coriolis just happens to be a small quantity - though relevant in calculation 
    if you are in a jet moving at around 400 knots.
    I have a theodolite made by British Aerospace with a North seeking gyro built 
    in which 'feels' the acceleration right enough to provide North to within a 
    few second of arc.
    Coriolis can be allowed for because the motion of the Earth is 'constant' so 
    the parameters can be calculated for the direction of travel and Latitude, 
    the main components affecting the apparent local gravitational field due to 
    Douglas Denny.
    Chichester. England.
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