  In this paper we examine the possibility of a Josephson AC effect between two
superconductors induced by the Earth's gravitational field, making use of the
gravito-Maxwell formalism. The theoretical framework exploits the symmetry
between the weak field expansion of the gravitational field and the standard
Maxwell formulation, combined with the Josephson junction physics. We also
suggest a suitable experimental setup, analysing also the related possible
difficulties in measurements.
