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    Satellites [Re: Measure of All Things]
    From: Jared Sherman
    Date: 2003 Oct 4, 13:25 -0400

    Trevor-
     
    
     I think the new accuracy of satellites comes from the fixed orbital physics 
    involved. The path of the satellite, the spherical nature of it (or not), 
    can all be defined, predicted, and conformed by observations from one orbit 
    to the next. From various ground stations with telescopes and synchronized 
    atomic clocks. Or in the case of GPS, onboard atomic clocks.
    
     Then the satellite, and precisely timed observations of it, provide a much 
    more precise "rod and chain" to measure the underlying distances with. An 
    invisible rod and chain, but a surprisingly rigid one.
    
    
    

       
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