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    Re: GPS as a time authority
    From: Douglas Denny
    Date: 2009 Sep 15, 12:30 -0700

    I should have added I believe the relativistic effect with the 'portable' 
    atomic clock was, if I remember correctly,  mosty due to the difference in 
    lower gravitational field potential, spending some considerable time at 
    40,000 ft at 350 Knotts as opposed to zero velocity at ground level - rather 
    than the time dilation effect due to motion which is fairly 'slow' with an 
    The GPS satellites have the same problem but multiplied, and if not corrected 
    will give a discrepancy of position of some dozens of miles. I expect the 
    high velocity of satellites might become significant in relativistic effect 
    too.  I would like to know the relative values of motion Vs. gravitational 
    relativistic effect with satellites. I am sure I have read of it somewhere 
    but bad memory these days is becoming an increasing problem.
    Douglas Denny.
    Chichester. England.
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