Re: Earth rotation rate

From: Tony Beresford (aberesford@iprimus.com.au)
Date: Wed Apr 03 2002 - 22:15:25 EST

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    At 11:04 4/04/02, Jonathan T Wojack wrote:
    
    
    >A have another question, though:
    >
    >Stars appear to "travel" from East to West from night to night. 
    >Satellites with inclinations of 90.000 degrees and less (there's a term
    >for this, it's the opposite of "retrograde," but at the moment I can't
    >remember it....) travel from West to East.  Am I correct in thinking that
    >this does not matter, that the only important detail is the orbital
    >period?
    The only geostationary orbit is zero inclination prograde orbit
    with a period of 1 sidereal day. 
    Orbits whose period is a simple fraction of 1 sidereal day,
     and are of non-zero inclination should
     be called geosynchronous, as can 1 day orbits of non-zero inclination.
    The subsatellite point traces out the same path in latitude longitude
    for each day. working examples include the GPS satellites and the molniya
    comsats, and the 3 Sirius comsats providing music for US motorists.
    Tony Beresford
    
    
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