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Re: Calculating Astronomical Sunset



A quick way is to use a tracking program that can display the footprint of
the satellite and the illuminated earth. If "daytime" on the ground and the
footprint intersect, then the sat is illuminated.

Drew, KO4MA

----- Original Message -----
From: "DOUGLAS KUITULA" <ka8qcu@juno.com>
To: <amsat-bb@AMSAT.Org>
Sent: Tuesday, November 27, 2001 6:38 PM
Subject: [amsat-bb] Calculating Astronomical Sunset


> Hi all,
>  While trying to get a look at Starshine, I was trying to determine how
> long the bird would be in sunlight while my QTH was in the dark. In the
> past I've usually figured on a couple of hours for most LEO satellites.
> But it got me wondering if there is a formula to determine, more
> accurately, how long a satellite will be in sunlight after sunset on the
> ground.
>  Of course the altitude of the bird would be a factor, as well as the
> circumference of the earth. But it's been 30 years since I got out of
> college and I've forgotten most of my physics and geometry. Any ideas?
>  Thanks in advance. 73 de Doug KA8QCU
>
> ka8qcu@juno.com
>
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