Re: STS-114 / ISS Double Sun Transit

From: Gerhard HOLTKAMP (
Date: Mon Aug 01 2005 - 17:07:03 EDT

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    Rainer Kresken wrote (with regard to observing ISS transits in front of the 
    >and how do I know what the course of the groundpath is and when a transit
    >occurs close to my home?
    to the best of my knowledge there are a few programs available and a website 
    or two which can handle this problem. I use my very own program, SatCal, 
    which apart from transits does a few other useful things like flare 
    calculations and launch orbits. It's Open Source Freeware and identical 
    versions exist for Windows and Linux. I still have to put it properly on a 
    website for download (only a fairly ancient version - Windows exe only - 
    exists on but I'm happy to e-mail the latest 
    version to whoever is interested.
    Of course - no matter what program you use - you have to get into the habit of 
    regularly checking  for such transits. I have caught myself often enough to 
    ignore it for months at a time until all of a sudden I seem to remember these 
    kind of observations!
    Gerhard HOLTKAMP
    Darmstadt, Germany
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