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).

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.
References in periodicals archive ?
If (Pi.y>Pf.y ABS(Pi.x-Pf.x)>1) Counter-Clock Rotation
Then, a differential form for the small-angle rotations is given by
Nonetheless, most of energy balance studies have been evaluated based on crop and very few on crop rotations. Moreover, studies on both soil tillage and crop rotation together are very few.
After the complete resection of the thickened CHL, a smooth sliding movement of the subscapularis with internal and external rotation of the shoulder joint could be achieved.
At the end of the mandatory rotation, 87% of students felt the rotation was beneficial and 89% of students were glad it was mandatory.
* More than 30% of rotations were attempted with vacuum devices.
Crops rotation is a tool used to manage population level soil born plants diseases causing organisms and soil fertility level.
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.
Mikkelsen, M.D., from the University of Pennsylvania in Philadelphia, and colleagues implemented an automated REDCap survey to measure intensivist well-being upon completion of four clinical rotations that varied in structure, staffing, and nighttime workload at two hospitals within Penn Medicine.
It has compared four rotations continuous wheat; continuous cereal (wheat, wheat, barley); district practice (wheat, wheat, legume, and wheat, wheat, fallow); and diverse (wheat, legume, canola).
Tough decisions redrafting nighttime jet noise patterns around O'Hare International Airport start next month when an advisory group considers which runways to use in a weekly rotation.