Re: PAS 1R

From: Jonathan T Wojack (tlj18@juno.com)
Date: Wed Apr 03 2002 - 15:51:00 EST

  • Next message: Matson, Robert: "Earth rotation rate"

    > The earth rotates once every 23 hours 56 minutes 4 seconds RELATIVE
    > TO THE STARS (24 hours 0 minutes 0 seconds, on average, relative to
    > the sun). 
    
    That I know, and agree with.
    
    >And incidentally, the "1.00270296" revolutions per 
    > [24-hour]
    > day in the TLE may well include small factors due to perturbations,
    > but that is not the major issue here; the true sidereal rotation
    > period of the earth is 24 hours / 1.0027379.. .
    
    The difference between the two figures amounts to 2.59 seconds per day.
    
    But what is the point in making a geosat synchronous with the stars? 
    It's not going to stay over an area of Earth (more or less).  What is the
    purpose for a geosat to track the stars?
    
    ------------------------------
    Jonathan T. Wojack                 tlj18@juno.com
    39.706d N   75.683d W            5 hours behind UT (-5)         
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