Many UFO sightings at night can be explained by Satellites, particularly the bright ones such as the ISS. Some websites such as Heavens-Above.com use a very text based interface which can be difficult to use making it hard to find satellite passes that match the observation. The website www.in-the-sky.org offers a graphical method of searching historical satellite passes. In my experience it offers a better way of determining which man-made orbital objects can explain UFO sightings.
Instructions for use
You first have to set the sighting location & time zone ... Read even more
