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A geostationary orbit, geostationary Earth orbit or geosynchronous equatorial orbit (GEO) is a circular orbit 35,786 kilometres above the Earth's equator and following the direction of the Earth's rotation. These are the orbits in which time period of orbital motion of satellite is equal to the time period of spin motion of Earth about its axis. An object in such an orbit has an orbital period equal to the Earth's rotational period (one sidereal day) and thus appears motionless, at a fixed position in the sky, to ground observers. Satellites placed in geostationary orbits allow the communication with satellite antennas (located on Earth) without have to rotate to track them, but can be pointed permanently at the position in the sky where the satellites are located.