  Gravity gradiometry within the framework of the general theory of relativity
involves the measurement of the elements of the relativistic tidal matrix,
which is theoretically obtained via the projection of the spacetime curvature
tensor upon the nonrotating orthonormal tetrad frame of a geodesic observer.
The behavior of the measured components of the curvature tensor under Lorentz
boosts is briefly described in connection with the existence of certain special
tidal directions. Relativistic gravity gradiometry in the exterior
gravitational field of a rotating mass is discussed and a gravitomagnetic beat
effect along an inclined spherical geodesic orbit is elucidated.
