According to this, if someone spins around at 2 revs per second when the moon is in the horizon, the moon seems to move at 4 times the speed of light. And this implies the moon is not in our local reference frame. And per this, local inertial frame applies to "small regions of a gravitational field". So the moon and earth are not in a "small region of a gravitational field"? I know all this boils down to the explanation what a reference frame is. Can someone clarify?