Definition of geostationary
: being or having an equatorial orbit at an altitude of about 22,300 miles (35,900 kilometers) requiring an angular velocity the same as that of the earth so that the position of a satellite in such an orbit is fixed with respect to the earth
Did You Know?
We don't give much thought to geostationary satellites, but many of us rely on them daily. Anyone who watches satellite TV or listens to satellite radio is dependent on them; the weather photos you see on TV are taken from geostationary satellites; and military information gathering via satellite goes on quietly day after day. (Though the satellites that provide GPS service for your car or cell phone actually aren't geostationary, since they orbit the Earth twice a day.) By 2009 there were about 300 geostationary satellites in operation, all of them moving at an altitude of about 22,000 miles. Since they hover above the same spot on Earth, your receiving dish or antenna doesn't have to turn in order to track them.
First Known Use of geostationary
Learn More about geostationary
Britannica English: Translation of geostationary for Arabic speakers
Seen and Heard
What made you want to look up geostationary? Please tell us where you read or heard it (including the quote, if possible).