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Axis of rotation

three-dimensional object always rotates around an imaginary line called a rotation axis. Purely rotational motion occurs if every particle in the body moves in a circle about a single line. This (straight) line is called the axis of rotation
A sphere rotating around an imaginary axis

The Axis of rotation is an imaginary line passing through the centre of mass of any celestial body around which the celestial body rotates. In case of Earth, the axis of rotation of Earth passes through the north pole, the centre of mass of Earth and the south pole. The Earth makes one complete rotation around this imaginary axis every 23 hours 56 minutes 4 seconds.The line passes through the north and south poles of a planet.

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