geostationary orbit

Science Dictionary
geostationary orbit   (jē'ō-stā'shə-něr'ē)  Pronunciation Key 
A circular orbit positioned approximately 35,900 km (22,258 mi) above Earth's equator and having a period of the same duration and direction as the rotation of the Earth. An object in this orbit will appear stationary relative to the rotating Earth. Communications and weather satellites are usually placed in a geostationary orbit. See also synchronous orbit.
The American Heritage® Science Dictionary
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