You mean like this:) Here's the approx area, where the iss will Buzz Jupiter ISS 20.0 10.0 0.0 0.5 d 1 25544U 98067A 04043.71650473 .00016531 00000-0 15159-3 0 1761 2 25544 51.6266 244.5270 0007160 158.0764 202.1067 15.67023840298639 12 Feb 2004 17:00:00.00 -37.9164 -179.0460 12 Feb 2004 17:00:01.00 -37.8691 -178.9852 12 Feb 2004 17:00:02.00 -37.8220 -178.9242 12 Feb 2004 17:00:03.00 -37.7744 -178.8641 12 Feb 2004 17:00:04.00 -37.7271 -178.8034 12 Feb 2004 17:00:05.00 -37.6796 -178.7431 12 Feb 2004 17:00:06.00 -37.6322 -178.6826 12 Feb 2004 17:00:07.00 -37.5850 -178.6218 12 Feb 2004 17:00:08.00 -37.5373 -178.5620 12 Feb 2004 17:00:09.00 -37.4898 -178.5018 12 Feb 2004 17:00:10.00 -37.4424 -178.4413 This is the predicted path for 0 m elevation in terms of the ellipsoid. The ellipsoid is different then sea level, so that one thing that must be factored in. For example for my location there's a diference of approx 32.7 m between the sea level height and the ellipsoid height. So for example if I am approx 132.7 m above sea level, then I would be 100 m approx above the ellipsoid. And while SGP4/SDP4 uses the old WGS72 datum, the newest datum is ITRF 2000. So which datum is used for the obsevers position, will have some effect on the computations. But then errors in the iss, planet and observer's position will effect the real view. So I like to compute where the iss will pass approx across a planet, then send out a prediction, so people can watch the iss pass by the planet fairly close, are it passes a few degrees away. It makes for a nice view, and people like to watch the show. The predictions I generate are good enough for me and others, to see something, that all that matters to me. If tom generates very precise info, good for him. People can use his info, and get a really nice view. Kevin --- Tom Wagner <wagnert@walnutridge.pvt.k12.ia.us> wrote: I would imagine that once Tom gets the predictions up for ISS transits of planets, using a GPS unit will almost be a must! ===== COSPAR Site #1775 Long 75.6910 W, Lat 44.6062 N, altitude 100 metres __________________________________ Do you Yahoo!? Yahoo! Finance: Get your refund fast by filing online. http://taxes.yahoo.com/filing.html ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
This archive was generated by hypermail 2b29 : Thu Feb 12 2004 - 15:39:33 EST