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":

Mc Math-Pierce Solar Telescope - Instruments

... two spectrographs are able to rotate to compensate for the

... two spectrographs are able to rotate to compensate for the

**rotation**of the image caused by the use of a heliostat ... 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 ...**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 ... 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 elements ... surface, it generally corresponds to two

**rotation**systems, one for each of the two orientations of the surface ...

Conformational Isomerism

... can be interconverted exclusively by

... 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 that there exists a rotational energy ... 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 ...

Detent

... device used to mechanically resist or arrest the

... 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)

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