rotation

Rotation, or spin, is the circular movement of an object around a central axis. A plane figure can rotate in either a clockwise or counterclockwise direction around a perpendicular central axis intersecting anywhere inside or outside the figure. A solid figure has an infinite number of possible central axes and rotational directions.
If the rotation axis passes internally through the body's own center of mass, then the body is said to be autorotating or spinning, and the surface intersection of the axis can be called a pole. A rotation around a completely external axis, e.g. the planet Earth around the Sun, is called revolving or orbiting, typically when it is produced by gravity, and the ends of the rotation axis can be called the orbital poles.

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