Hi all! There are a lot of programs giving previsions and using TLEs. But does a program exist which would give the TLEs using observations? As I have a system which allows to get accurate positions and instants, I would be very interested in such a program but for IBM-DOS or WINDOWS 3.1 (I described my system in july on the list and it is also described in my WEB page) Thanks beforehand! My pleasure, avec plaisir, Alphonse alphonse.pouplier@ping.be http://www.ping.be/alphonse http://home.ml.org/alphonse http://ourworld.compuserve.com/homepages/ALPHONSE http://www.ping.be/~ping5861 Main coord.: Wepion (Belgium) +50d25m27s 4d51m42s East phone: ..32 (0)81 460122 fax : ..32 (0)81 460567 Aux. coord.: Esparron de Verdon (France) +43d44m19s 5d58m12s East phone: ..33 (0)4 92 771407 Les habitudes sont les ennemies du progres.