  The inertial (due to rotation) and gravitational fields of the Earth affect
the motion of an elementary particle and its spin dynamics. This influence is
not negligible and should be taken into account in high-energy physics
experiments. Earth's influence is manifest in perturbations in the particle
motion, in an additional precession of the spin, and in a change of the
constitutive tensor of the Maxwell electrodynamics. Bigger corrections are
oscillatory, and their contributions average to zero. Other corrections due to
the inhomogeneity of the inertial field are not oscillatory but they are very
small and may be important only for the storage ring electric dipole moment
experiments. Earth's gravity causes the Newton-like force, the reaction force
provided by a focusing system, and additional torques acting on the spin.
However, there are no observable indications of the electromagnetic effects due
to Earth's gravity.
