# Rotation

## Movement of an object around an axis / From Wikipedia, the free encyclopedia

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**Rotation** or **rotational motion** is the circular movement of an object around a central line, known as * axis of rotation*. A plane figure can rotate in either a clockwise or counterclockwise sense around a perpendicular axis intersecting anywhere inside or outside the figure at a

*center of rotation*. A solid figure has an infinite number of possible axes and angles of rotation, including chaotic rotation (between arbitrary orientations), in contrast to rotation around a

*fixed*axis.

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The special case of a rotation with an internal axis passing through the body's own center of mass is known as a **spin** (or *autorotation*).^{[1]} In that case, the surface intersection of the internal *spin axis* can be called a *pole*; for example, Earth's rotation defines the geographical poles.
A rotation around an axis completely external to the moving body is called a **revolution** (or *orbit*), e.g. Earth's orbit around the Sun. The ends of the external *axis of revolution* can be called the *orbital poles*.^{[1]}

Either type of rotation is involved in a corresponding type of angular velocity (spin angular velocity and orbital angular velocity) and angular momentum (spin angular momentum and orbital angular momentum).