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sgp4/sdp4 vs sgp8/sdp8

There is a note in "Spacetrack report No. 3" that Norad was thinking of
switching from sgp4/sdp4 to sgp8/sdp8.  I was wondering if anyone knew which
models Norad and Nasa are currently using.  Just thinking that you get the best
answers using the same model the people who came up with the keps were using.

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