This gradual movement of the points, called the precession of the equinoxes, is caused by a slight change in the direction of the earth's axis of rotation.
(This gradual movement of the points; called; the precession of the equinoxes) (This gradual movement of the points; is caused; by a slight change in the direction of the earth's axis of rotation)
This gradual movement of the points This gradual movement of the points
called is caused
the precession of the equinoxes
by a slight change in the direction of the earth's axis of rotation