re:Sat.program predictions

From: Greg Roberts (
Date: Tue Oct 31 2006 - 10:00:10 EST

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    Hi Thomas
    I see no reason for anyone to be cross with anyone in
    the discussion about prediction programs - I certainly
    am NOT! 
    I personally welcome such discussion. Most of the
    software floating about now was based on the SGP4
    and SDP4 models given in a paper which is now very
    obsolete and contained quite a few errors. In addition
    many authors made changes to the original software and
    I understand that even SPACETRACK no longer uses
    it so it is worthwhile knowing about any possible
    errors and how/where they might arise.
    I look forward to the first program that comes out that
    uses the latest SGP4/SDP4 code that was put on the
    Internet in August 2006.
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