Question

Why do geostationary satellites appear stationary in the sky?

Answer 1

At this altitude one orbit takes 24 hours,the same length of time as the earth requires to rotate once on its axis. The term geostationary come from the fact that such a sattelite appears nearly stationary in the sky as seen by a ground based observer.

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Answer 2

Geostationary satellites appear stationary since they are placed high above the equator and they revolve clockwise as the earth does, hence an observer viewing from the ground level views them as stationary.

The Geostationary orbit altitude is approximated to be over 20000 miles over the equator. This altitude is very big hence it needs a directional antennae to access the satellite.