Using what ted molczan said. Adjusting for Earth's rotation is not difficult, but it can be tedious. An easy method is to adjust the epoch by the desired time increment. For example, to compute the path of an object if it arrives 2 min early, subtract 2/1440 from the epoch. The above epoch would become 02115.12912960 - 2/1440 = 02115.12774071 . I have adjusted the orbital elements for USA 102. They start with the the old orbital element, and the epoch is adjusted up until that sat being 20 munutes early. For example the USA 102-2 means this element has it epoch adjusted for it being 2 minutes early. And USA 102-4 means 4 minutes early, and so on. USA 102-2 1.0 0.0 0.0 6.9 v 1 70001U 02115.12774071 .00010500 00000-0 67123-3 0 08 2 70001 105.0290 67.4212 0021000 276.6353 83.3646 15.08406176 02 Here they are USA 102 1.0 0.0 0.0 6.9 v 1 70001U 02115.12912960 .00010500 00000-0 67123-3 0 08 2 70001 105.0290 67.4212 0021000 276.6353 83.3646 15.08406176 02 USA 102-2 1.0 0.0 0.0 6.9 v 1 70001U 02115.12774071 .00010500 00000-0 67123-3 0 08 2 70001 105.0290 67.4212 0021000 276.6353 83.3646 15.08406176 02 USA 102-4 1.0 0.0 0.0 6.9 v 1 70001U 02115.12635182 .00010500 00000-0 67123-3 0 08 2 70001 105.0290 67.4212 0021000 276.6353 83.3646 15.08406176 02 USA 102-6 1.0 0.0 0.0 6.9 v 1 70001U 02115.12496293 .00010500 00000-0 67123-3 0 08 2 70001 105.0290 67.4212 0021000 276.6353 83.3646 15.08406176 02 USA 102-8 1.0 0.0 0.0 6.9 v 1 70001U 02115.12357404 .00010500 00000-0 67123-3 0 08 2 70001 105.0290 67.4212 0021000 276.6353 83.3646 15.08406176 02 USA 102-10 1.0 0.0 0.0 6.9 v 1 70001U 02115.12218515 .00010500 00000-0 67123-3 0 08 2 70001 105.0290 67.4212 0021000 276.6353 83.3646 15.08406176 02 USA 102-12 1.0 0.0 0.0 6.9 v 1 70001U 02115.12079626 .00010500 00000-0 67123-3 0 08 2 70001 105.0290 67.4212 0021000 276.6353 83.3646 15.08406176 02 USA 102-14 1.0 0.0 0.0 6.9 v 1 70001U 02115.11940737 .00010500 00000-0 67123-3 0 08 2 70001 105.0290 67.4212 0021000 276.6353 83.3646 15.08406176 02 USA 102-16 1.0 0.0 0.0 6.9 v 1 70001U 02115.11801848 .00010500 00000-0 67123-3 0 08 2 70001 105.0290 67.4212 0021000 276.6353 83.3646 15.08406176 02 USA 102-18 1.0 0.0 0.0 6.9 v 1 70001U 02115.116629600 .00010500 00000-0 67123-3 0 08 2 70001 105.0290 67.4212 0021000 276.6353 83.3646 15.08406176 02 USA 102-20 1.0 0.0 0.0 6.9 v 1 70001U 02115.115240711 .00010500 00000-0 67123-3 0 08 2 70001 105.0290 67.4212 0021000 276.6353 83.3646 15.08406176 02 Use with caution. Kevin _________________________________________________________________ Chat with friends online, try MSN Messenger: http://messenger.msn.com ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www.satellite.eu.org/seesat/seesatindex.html
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