# rotation

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## rotation

1. Spinning motion of a celestial body or a group of gravitationally bound bodies, such as a galaxy, about an axis, as distinct from orbital revolution. Almost all celestial bodies show some degree of rotation. Young stars arrive on the main sequence with a high rotation rate; this results from the conservation of angular momentum during their collapse from a cloud of interstellar gas. As a star ages, structural changes in its interior and interactions with its surroundings produce changes in its speed of rotation. The hottest (O and B) stars have very great rotation rates of about 200–250 km s–1. Sunlike stars spin more slowly as they age, although some are able to retain their rapid rotation. The faster the rate of rotation the broader and shallower the star's spectral lines and the stronger the magnetic field (see corona). See also differential rotation; direct motion; synchronous rotation.
2. One complete turn of a celestial body about its axis. The Earth takes one sidereal day to make one rotation. Ideally the rotation period of other bodies is measured as the time interval between successive passages of a meridian line on the surface across the center of the disk, as seen from Earth. The solid surface may however be unobservable and indirect measurements, as by radar, are then employed. The rotation period of a gaseous body, such as the Sun or the planet Jupiter, varies with latitude, being greatest at the equator (see differential rotation).
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

## rotation

[rō′tā·shən]
(computer science)
An operation performed on data in a register of the central processing unit, in which all the bits in the register are shifted one position to the right or left, and the endmost bit, which is shifted out of the register, is carried around to the position at the opposite end of the register.
(mathematics)
(mechanics)
Also known as rotational motion.
Motion of a rigid body in which either one point is fixed, or all the points on a straight line are fixed.
Angular displacement of a rigid body.
The motion of a particle about a fixed point.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Rotation Manager is a US-based most effective and reliable software for clinical placement and detailed scheduling of clinical rotations for health and nursing programs in the busy health institutions.
Alternating such crops will ensure that nutrients from different layers are well-utilisedCrop rotation helps one control build-up of soil-borne pests and diseases.
Data on C : N ratio, as influenced by rotation, for 0-5, 5-15, 15-30 and 30-60 cm depth at both locations are presented in Table 1.
The Rotation Policy 2019 will be based on 7 objectives based on experience of operation of the existing Rotation Policy and the lacunae/distortions observed therein.
According to meeting minutes, the meeting discussed that the Balochistan-domiciled PAS/PSP officers complain about the province's specific provisions of the Rotation Policy on the ground that it tends to provincialise them despite being members of the All Pakistan Service.
Committee members are expected to start specifying runways to use in the rotation at November's meeting.
The load of ice causes compression and further bulge at the equator, slowing the rotation. When the earth warms again, the ice melts, the pressure relaxes, the bulge reduces and the rotation speeds up.
They have argued that rotation reduces audit quality because a firm doesn't get enough time to learn in-depth how a client operates.
The signal of the molecular-electronic angular motion sensor after being brought to the rotation in accordance with the dynamic method algorithm and calculation of the Fourier transform at the platform rotation frequency is as follows:
Any change is the Earth's rotation speed is minuscule.
Any radiographic measurement, however, is prone to errors stemming from variations in limb deformity and position.[7],[8],[9] Despite efforts made to maintain a standardized position in which the patella points straight ahead, this positioning does not necessarily control for some factors, such as unpredictable degrees of rotation of the femur that occur in a severely deformed, arthritic knee.

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