To be precise: TLEs are mean elements, not true (osculating) elements. Together with the epoch they represent the starting point from which on the perturbation effects are calculated for the specific time of interest. Even if you calculate the true orbital elements at the exact time of epoch out of a TLE set (i.e. no time has passed since epoch), the resulting elements are different than the TLE values. However this difference is small. Cheers, Sebastian ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www2.satellite.eu.org/sat/seesat/seesatindex.html
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