Re: Geodetic precision

Date: Wed Aug 22 2001 - 08:31:49 PDT

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    Just to clarify things (to the best of my knowledge), SGP4 was developed by
    Ken Crawford in 1970 and SDP4 by R. S. Hujsak in 1979. Felix Hoots and Ron
    Roehrich wrote Spacetrack Report 3 in 1980 for the Air Force I believe
    which widely distributed the models. Software with these models began
    appearing several years later. TS Kelso provided the report in pdf format
    (1988) which helped further distribute the models.
    Bill Bard
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