Geosynchronous orbit
From Halopedia, the Halo wiki
A diagram of a Geosynchronous orbit
A satellite or spacecraft in an orbit above the equator, revolving at a rate of speed synchronous with that of the earth's rotation so that it always stays above the same place on the earth's surface.
Some spacecraft and Orbital Defence Platforms use this orbit to maxamise there coverage of broadcasts or to protect a certain area of a planet.
