Re: Calculating declination of geosat belt?

From: Bram Dorreman (bram.dorreman@skynet.be)
Date: Wed Feb 23 2005 - 15:02:59 EST

  • Next message: Larry Ridolfi: "RE: Two unrelated questions"

    I ran Mike McCants's program Highecl because it limits the prediction points
    within 2.5 of the earth shadow. After two years of observation around the
    specific dates I know the sky areas almost by heart. However every year I
    discover some details to ease and improve my (visual) observations.
    
    Happy geosat observing.
    
    Bram Dorreman
    Collector PPAS observations
    
    
    ----- Original Message -----
    From: "Ed Cannon" <ecannon@mail.utexas.edu>
    To: <seesat-l@satobs.org>
    Sent: Wednesday, 2005 February 23 07:50
    Subject: Calculating declination of geosat belt?
    
    
    > 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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