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RE: Calculating Astronomical Sunset



Doug,

WinOrbit displays the sunlight/eclipse data for each bird in the table, as
most of the tracking programs probably do.  It also shows the terminator
line (map option - "Show Solar Illumination").  Blowing the map up and
manually stepping through the pass should give you a good idea of your sun
rise/set versus the satellite's illumination.  Alternately, W4SM's program
TrackSM will give you specific sun and moon data for your QTH, so you could
compare it to the satellite predictions.

73,
Dan Fitch, KG4OVP
Melbourne, FL

-----Original Message-----
From: owner-AMSAT-BB@AMSAT.Org [mailto:owner-AMSAT-BB@AMSAT.Org]On
Behalf Of DOUGLAS KUITULA
Sent: Tuesday, November 27, 2001 6:38 PM
To: amsat-bb@AMSAT.Org
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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