Abstract: The present invention relates to a gravity rotary device having: a first disk with a central axis; and at least one peripheral axis of rotation arranged at a distance from and parallel to the central axis; at least one peripheral rotary shaft suitable for turning about the peripheral axis of rotation; and at least one mass support mounted on the peripheral rotary shaft and having a mass suitable for being moved away from the rotary shaft in order to produce torque causing the rotary shaft and the first disk to pivot.