What If The Earth Stopped Spinning?
A rotation is a circular movement of an object around a center of rotation . A three-dimensional object always rotates around an imaginary line called a rotation axis. If the axis passes through the bodys 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.
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 (source : wikipedia)
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