Calculating declination of geosat belt?

From: Ed Cannon (ecannon@mail.utexas.edu)
Date: Wed Feb 23 2005 - 01:50:01 EST

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    Someone asked me how to determine the declination of the 
    geosat (Clarke) belt from his location.  I know there's a 
    formula, but I don't know what it is and can't locate it 
    online right now.  (There's something close on Celestrak.org, 
    because it shows how to calculate altitude/elevation and 
    azimuth -- http://celestrak.com/columns/v04n09/ --.)  
    
    What I do is just run predictions for a location and look 
    for the declinations of the active geosats -- the ones that 
    stay on the same declination all night.
    
    Here are some geostationary azimuth and elevation javascript 
    calculators:
    
    http://www.csgnetwork.com/geosatposcalc.html
    http://www.sfwx.com/softworks/geoBearing.html
    http://web.bsu.edu/tti/3_2/3_2e.htm 
    
    The third one shows formulas and code.
    
    But I don't find any that calculate RA and Dec.  (Of 
    course to calculate RA it would want a specific time, but
    all we need is the declination.)
    
    Ed Cannon - ecannon@mail.utexas.edu - Austin, Texas, USA
    
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