Earth orbit
Earth orbit is, simply, an
orbit around the
planet Earth. The
Moon, Earth's only natural satellite, is in Earth orbit. Artificial satellites are launched into Earth orbit, and
spacecraft bound for other locations in the
solar system usually begin their missions by first attaining Earth orbit, before altering course to another planet, moon, or
heliocentric (solar) orbit.
Of special interest are LEO (Low Earth Orbit), HEO (High Earth Orbit) and geosynchronous orbit.