bulge of the EarthThe extension of the equator caused by the centrifugal force of Earth's rotation, which slightly flattens our planet's spherical shape. This bulge causes the planes of satellite orbits inclined to the equator (but not polar) to rotate slowly around Earth's axis. Related entry• station-keepingRelated category• CELESTIAL MECHANICSAlso on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History |