At 06:49 AM 11/6/97 +0100, Bjoern Gimle wrote: >I agree on that - SGP4 should be OK in most programs with relatively >fresh elsets - corrected SDP4 needed only for old elsets of dead >geostationaries (or eccentric orbit satellites) OK, now I'm starting to get somewhere! ;-) I've been wondering about the differences in SGP4 and SDP4. At least now I have a clue. Would someone "in the know" please cllue me in? Earl Earl Needham, KD5XB Clovis, NM Conquistador Council, BSA mailto:KD5XB@AMSAT.ORG Phi Mu Alpha Sinfonia, Pi Chi '76 (That was Texas A&I University.) (BTW - spent a year at SLU, too!) Spambot Bait: root@localhost postmaster@localhost admin@localhost abuse@localhost spam@primenet.com