  Several satellite missions, devoted to the study of the Earth gravity field,
have been launched (like CHAMP, recently). This year, GRACE (Gravity Recovery
and Climate Experiment) will allow us to obtain a more precise geoid. But the
most important is that they will supply the temporal variations of the
geopotential coefficients (called Stokes coefficients). In the poster we show
how the Earth gravitational potential is linked to the Earth rotation
parameters. Indeed, through the Earth inertia coefficients, we can connect the
variation of LOD and Polar Motion with the temporal variations of the Stokes
coefficients. We also consider the nutations, that are related to the
gravitational geopotential coefficients. We discuss the possibility of using
the Stokes coefficients in order to improve our knowledge of the Earth
rotation.
