Abstract: A gravity gradiometer and method for measurement of changes in the intensity of a gravitational field experienced during traversal over earth's terrain, or past a massive object, has a set of eight accelerometers disposed on rotating disc, or on a pair of parallel discs, and arranged uniformly about a central rotational axis of the disc, or of the pair of discs. Each accelerometer develops a signal for maintaining a pendulum in its position of swing along an input axis of the accelerometer. Each input axis, for all of the accelerometers, is perpendicular or parallel to a radius of a disc. The accelerometers are treated as two groups of four accelerometers wherein, in each group, the accelerometers are disposed in pairs about perpendicular diameters of the disc or the pair of discs.