Geosynchronous satellites congregate?

From: Tom Wagner (sciteach@mchsi.com)
Date: Sun Jun 11 2006 - 16:57:46 EDT

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    I am using my planetarium program to see if the orbital altitude of the 
    geosynchronous satellites listed in the program match with what I saw on the 
    Net was the appropriate distance for them to have a 24 hour orbital period. 
    I compared their distances with calculations made at this site 
    http://liftoff.msfc.nasa.gov/academy/rocket_sci/orbmech/vel_calc.html and 
    get a close match. Does the orbital period need to be exactly 24 hours?
    
    As an experiment I tried stepping ahead in time a day at a time. What I saw 
    was very peculiar. Within a year or two a lot of the satellites that I saw 
    generally south of my position of 92 degrees W longitude began to congregate 
    directly south of me. Is this a phenomenon that would occur if the 
    satellites did not compensate via onboard propellant?
    
    Tom   Iowa  USA 
    
    
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