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 ----------------------------------------------------------------- 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/seesat/seesatindex.html
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