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    Re: New false horizons? Just watch satellites...
    From: Bob Goethe
    Date: 2017 Jul 22, 22:48 -0700

    Frank, what would the components of such a "kit" be?  That is, what would it take to convert "visual satellite navigation (VSN)" into a complete system?  I presume we are talking about some sort of software app?

    Based on what you have said in this post, plus what I can remember of your previous posts, it would seem that the software would produce an array of star charts with the ISS track superimposed, which would match a variety of latitude and longitude combinations.  You would start with an assumed position, and get a number of charts that would cover locations within a certain radius of your assumed position.

    If your assumed position is 100 miles in error, the now-traditional St. Hilaire method will yield a really long intercept...but it will still help establish a fix, and will provide the raw material for a much more accurate assumed position when you do your next sight.  I am guessing that with "VSN" if your initial AP was way out, you would try and dial in your position a bit more accurately on the next orbit of the ISS.

    Alternatively, if you could photograph the ISS at a predetermined time, then you could search up a matching chart at your leisure.


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