I am forwarding the following message on behalf of Rob Matson. --Ted M. Hi All, A quick chime-in on SGP4/SDP4 -- I've done a quick peruse of the "latest" source code, and I'll be surprised if it produces results that are any more accurate than what is currently reported by SkyMap. Indeed, I found bugs in both T.S. Kelso's and Goddard's implementations of SGP/SDP4 in the past, and went to great trouble to correct them, so I'm frankly hesitant to make any new code changes when neither Goddard nor U.S. Space Command has a very good track record of "getting it right". Nevertheless, I may one day try running the new code with its test cases as is and comparing it to SkyMap to see how much they differ. If the results are very similar, that would add confidence that both models are accurate implementations of the intended algorithm(s). --Rob ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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