A geostationary satellite appears standstill to a viewer on the equator of earth.

A geostationary satellite appears standstill to a viewer on the equator of earth.
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Answer :

Because these satellites are in the geosynchronous orbit (an orbit around the Earth with an orbital period matching the Earth's sidereal rotation period)
Geostationary orbit is a type of geosynchronous orbit that is directly above the equator
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