Michael Waterman wrote: > BTW Robert Matson had an error in his posting on precession: > >delta Omega is in deg/day > it should be rad/day. Which equation? Certainly the latter is correct: > delta Omega = -2.06574E+14 * 3.94127E-14 * cos(51.6) = -5.06 deg/day > As Frank Reed said: > >You can get excellent satellite position predictions by > >including only three effects: precession of the node, precession > >of the perigee, and decay of the semimajor axis. > > My program does this. It is currently in Qbasic, and for stable orbits > gives good predictions for several months. So what would be a "respectable" TLE for the ISS during the transit of Venus? Obviously, one can't predict true solar transit tracks 6 months in advance, but if what you say is correct, then one should be able to forecast generally (+/- 46 minutes in time, and +/- 11.5 degrees of longitude, for a given latitude) where to observe a solar transit of the ISS during the transit of Venus- which would be useful information for those that intend to do a bit of traveling for the event anyway. ----------------------------------------------------------------- To unsubscribe from SeeSat-L, send a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@satobs.org List archived at http://www.satobs.org/seesat/seesatindex.html
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