地球質量
Note that since Earth's mass density is in fact not uniform, this result must be multiplied by a factor that is roughly the ratio of the bulge mass density and the average Earth mass, approximately 0.18. The actual factor is somewhat larger, since there is some deformation in the deeper solid layers of Earth as well. Let us denote this factor by "x". Rigidity also lowers "x", though this is less relevant for most of the bulge, made of sea water.