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 - Sports
... Rotation, usually called spin, plays a role in many sports ... Topspin and backspin in tennis ...
Mc Math-Pierce Solar Telescope - Instruments
... spectrographs are able to rotate to compensate for the rotation of the image caused by the use of a heliostat ... third position can only be equipped with a static optical table with no image rotation correction and is therefore rarely used ... can only be used for imaging on static optical tables and do not provide image rotation correction ...
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 ... 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-edges) of G that is, for each edge of G we form two ... is embedded on an orientable but not oriented surface, it generally corresponds to two rotation systems, one for each of the two orientations of the surface ...
Conformational Isomerism
... in which the isomers can be interconverted exclusively by rotations about formally single bonds ... to as conformational isomers or conformers and specifically as rotamers when the rotation leading to different conformations is restricted (hindered) rotation, in the sense ... The rotational barrier, or barrier to rotation, is the activation energy required to interconvert rotamers ...
... 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)