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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 
    aircraft.
    
    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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