Re: ISS's Varying Orbit

From: Bill T Bard (
Date: Mon Dec 04 2000 - 05:34:36 PST

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    >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
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