<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (March 2014) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (March 2014) (Learn how and when to remove this template message) </Td> </Tr> <P> A rotation is a circular movement of an object around a center (or point) of rotation . A three - dimensional object can always be rotated around an infinite number of imaginary lines called rotation axes (/ ˈæksiːz / AK - seez). If the axis passes through the body's center of mass, the body is said to rotate upon itself, or spin . A rotation about an external point, e.g. the Earth about the Sun, is called a revolution or orbital revolution, typically when it is produced by gravity . The axis is called a pole . </P> <P> Mathematically, a rotation is a rigid body movement which, unlike a translation, keeps a point fixed . This definition applies to rotations within both two and three dimensions (in a plane and in space, respectively .) </P>

If in a motion the axis of the rotation passes through an object then the motion is called
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