# 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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