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Jaap, you may have answered this already, but I am wondering why I get diffierent information with nearly every site I check. I use the same geographical location, but when I compare your times (height and so on), other sites (the NASA Sighting Opportunities page, and Heavens Above), they are usually a little different by a minute or two (or a few degrees). I have not compared these to real sightings, but I am just curious why the sites would all have different times.