In a body animated only by the rotation movement, it is the place of the points that remain motionless.
In the case of the Earth, the axis of rotation is inclined 66º 33 '8 "with respect to the plane of the orbit, or 23º 26' 52" with respect to the axis of the orbit.
The axis of terrestrial rotation, also called the celestial axis or time axis, determines the North-South direction and in the North it is directed towards the Polar Star (to Ursae Minoris). However, it is animated by small movements that, over time, make it change direction.
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