A rotation is a circular movement of an object around a center (or point) of rotation.
Mathematically, a rotation is a rigid body movement which, unlike a translation, keeps a point fixed.
Matrix multiplications always have the origin as a fixed point.
Stars, planets and similar bodies all spin around on their axes.
The motion of the components of galaxies is complex, but it usually includes a rotation component.
Most planets in our solar system, including Earth, spin in the same direction as they orbit the Sun.
The laws of physics are currently believed to be invariant under any fixed rotation.
Euler rotations provide an alternative description of a rotation.
Table tennis paddles are manufactured with different surface characteristics to allow the player to impart a greater or lesser amount of spin to the ball.
The end result of any sequence of rotations of any object in 3D about a fixed point is always equivalent to a rotation about an axis.
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