Hello, someone asked me to identify a pair of satellites without providing very accurate data on the apparent path. However, the time is accurate to a few minutes and I was told that the satellites crossed each others track within 2 seconds -- this should help identification. However, I don't know of any software yet that could provide a list of such close encounters. Any suggestions? I could also post or mail the observation data if anyone wants to check it out. Greetings, Marco ----------------------------------------------------------- hahn@geographie.uni-kiel.de mh@sl.maus.de -----------------------------------------------------------