geosynchronous

An Earth Satellite orbit in which the satellite remains in a fixed position over a geographic location on the Earth. This requires that the orbital plane be in the SAME plane as the equator, and that the satellite's altitude be high enough for the satellite to revolve about the Earth AT a speed equal to that of the Earth's rotation. Geosynchronous orbits are common for most communications satellites, such as the Tracking and Data Relay Satellite System.

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