# Re: SUN keps ?

• Subject: Re: [amsat-bb] SUN keps ?
• From: "i8cvs" <domenico.i8cvs@xxxxxx>
• Date: Tue, 21 Mar 2006 17:12:35 +0100

```Hi Simon and All

To day 21 march is the vernal equinox the sun Right Ascension and
Declination are both = 0 degrees so the sun crosses the celestial equator in
the point of Aries and the sun rise exacly to the East AZ=90 degrees and set
exacly to the West AZ= 270 degrees.

To day but even tomorrow is a nice opportunity to verify if the Azimuth
to wich our antennas are oriented is correct or not particularly if  the
horizon on East and West are free from obstacles.

I will do the above ritual control about an hour from now when the
sun set here at the free horizon over the see in front of the beautiful
island of Ischia in the gulf of Napoli.

Best 73" de

i8CVS Domenico

----- Original Message -----
From: "Simon Brown (HB9DRV)" <simon@hb9drv.ch>
To: "Gary "Joe" Mayfield" <gary_mayfield@hotmail.com>; <amsat-bb@amsat.org>
Sent: Tuesday, March 21, 2006 9:14 AM
Subject: Re: [amsat-bb] SUN keps ?

> ----- Original Message -----
> From: "Gary "Joe" Mayfield" gary_mayfield@hotmail.com
>
> > It is possible to generate keps to put in your tracking program that
will
> > follow the sun and or moon, but they will go stale after a while,
because
> > as Simon points out they are not the correct kind of bodies.  To
generate
> > keps that will work for a while try this program.
> >
>
> [Warning - generalisations follow]
>
> The main thing being that the sun is not a satellite where as the Earth is
> (sort of). Even though the Moon is a satellite it gets pulled about by
other
> bodies. If you're into mathematics then the algorithms are very
interesting.
>
> I use the Sun and Moon to align my own satellite array.
>
> Johannes Kepler was an amazing guy, it's well worth reading what he did to
> develop his original work..Puts today's plug-and-pray operators (such as
> myself) into perspective.
>
> http://www.kepler.arc.nasa.gov/johannes.html
>
> Simon Brown
> ---
> http://blog.hb9drv.ch/
>
> Holidays: April 10 - 21, 2006 as GD4ELI
> ----
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