>Could someone please tell me why ISS's orbit changes from time to >time?? From my location it is normally visible in the early morning, >but during Shuttle missions it becomes visible in the evening. Did >anyone notice that, or did I just discover something big??? :-) This is basically because the plane of the ISS's orbit "moves" because the earth is not a perfect sphere. Some satellites, like low orbit weather satellites, pick their orbits so they pass by at about the same time each day. They do this by being in a near polar orbit. Bill Bard ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www2.satellite.eu.org/seesat/seesatindex.html
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