This paper concerns the dispute about spaceSpace, timeTime, and motion, about whether space, time, and motion are absolute or relative. This paper focuses on one aspect of the dispute by investigating a kind of motion, the rotationRotation of galaxies with respect to the inertialInertial frame. In rotating universesRotating Universe, distant galaxies rotate with respect to the inertial frameInertial Frame. Our universe does not rotate. Nonetheless, rotating universesRotating Universe throw light on our own, or so this paper argues. First, the paper presents historical evidence of the fundamental theoretical use of the rotating solution in physics. Second, the paper identifies three consequences for time and the causal order.