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 ?
For pelvic motions, WR has a significantly restrictions on pelvic rotation, pelvic tilt, and lateral motion of pelvis.
Studies have shown existence of pelvic rotation during walking in the frontal and the transverse planes for approximately 5[degrees] and 4[degrees], respectively 21].
This would suggest a greater torso rotation relative to the pelvic rotation is needed to achieve an accurate pass.
Similarly, limb height during batt derriere was achieved via anterior pelvic rotation (range: -12[degrees] to -39[degrees]) and pelvic obliquity (range: -43[degrees] to -88[degrees]).
The talented crew gyrates in Fosse's nervy way of stringing steps together--strut, accented pelvic rotation, thrust, shoulder shrug, split kick, and provocative pose.
The swing point of interest for the x-factor calculation was calculated as the difference between the upper torso rotation angle and the pelvic rotation angle at the top of the backswing.
Conversely, the degree of axial pelvic rotation (about Z-axis) was similar between throwers at the end of the backswing, but differed considerably at ball release.
The dependent variables were the pelvis and gesture leg orientation angles at the events and the peak values: anterior pelvic tilt (AT), posterior pelvic tilt (PT), left lateral pelvic tilt (LT), left pelvic rotation (LR), right pelvic rotation (RR), hip flexion (FL), hip hyperextension (HE), hip external rotation (ER), and hip abduction (AB) (Fig.
This implies that the pelvic rotation diminished after the BS event in the skilled group, while their upper trunk segment displayed a continuing motion.