A rotation is a circular movement of an object around a center (or point) of rotation. A three-dimensional object rotates always around an imaginary line called a rotation axis. If the axis is within the body, and passes through its 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.

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Other articles related to "rotation, rotations":

Rotation System - Formal Definition
... Formally, a rotation system is defined as a pair (σ,θ) where σ and θ are permutations acting on the same ground set B, θ is a fixed-point-free involution, and the group generated by σ and θ acts transitively on B ... To derive a rotation system from a 2-cell embedding of a connected multigraph G on an oriented surface, let B consist of the darts (or flags, or half-e ... surface, it generally corresponds to two rotation systems, one for each of the two orientations of the surface ...
Mc Math-Pierce Solar Telescope - Instruments
... These two spectrographs are able to rotate to compensate for the rotation of the image caused by the use of a heliostat ... The third position can only be equipped with a static optical table with no image rotation correction and is therefore rarely used ... optical tables and do not provide image rotation correction ...
Conformational Isomerism
... is a form of stereoisomerism in which the isomers can be interconverted exclusively by rotations about formally single bonds ... referred to as conformational isomers or conformers and specifically as rotamers when the rotation leading to different conformations is restricted (hindered) rotation ... The rotational barrier, or barrier to rotation, is the activation energy required to interconvert rotamers ...
Rotation - Sports
... Rotation, usually called spin, plays a role in many sports ... Topspin and backspin in tennis ...
... A detent is a device used to mechanically resist or arrest the rotation of a wheel, axle, or spindle ... Detents are for example used to simply arrest rotation in one direction or to intentionally divide a rotation into discrete increments ...

Famous quotes containing the word rotation:

    The lazy manage to keep up with the earth’s rotation just as well as the industrious.
    Mason Cooley (b. 1927)