What is GEO (Geostationary Earth Orbit)?

The Geostationary Earth Orbit concept was introduced in 1945 by British author and scientist Arthur C. Clarke in an article entitled “Extra-Terrestrial Relays” for Wireless World. It is a roundabout geosynchronous orbit 35,786 kilometres in height over Earth’s equator and it is 42,164 kilometers in radius from Earth’s center. The geostationary orbit is a special case of the geosynchronous orbit, which is any orbit with a period equivalent to Earth’s rotation period.