  Search for the Electric Dipole Moment of nuclear particles is at the
forefront of incessant quest for CP violation beyond Standard Model. The
ultimate target is to reach a sensitivity to the electric dipole moment of
neutrons, protons, deuterons etc. at the level of $\sim 10^{-15}$ nuclear
magnetons. Defying the common lore on weakness of gravity, spurious signals
induced by curved space-time in the gravity field of the rotating Earth become
quite substantial at such a daunting sensitivity. We review the recent
development in the field with an emphasis on the geometric magnetic field in
pure electrostatic systems at rest on the rotating Earth.
