As with Skymed 4 rocket the N-dot value from the TLE I used to find it, had a small negative value. Just as the day before when I was too late to have a search action. I was thinking: If one has two values of N it should be possible to calculate the N-dot value from them. My only question is: What is a suitable algorithm for this. Thanks for any solution. Bram Dorreman. _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-l
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