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 ?
Rotational molding may be a fairly simple process, but it places rather stringent demands on the materials, which can only easily be met by polyethylene, hence its dominance.
As the competition was focusing on each of the attraction's line and rotational symmetry from an aerial or 'bird's-eye view' (see Figure 4), the teacher used Google Earth to locate each attraction geographically and provide a brief virtual tour around its exterior (see Figure 5).
However the tool rotational speed increases the temperature also increases and refinement of dynamic crystallization behavior.
5, the dependency of phase and supply voltages and phase and supply currents at different rotational speed is represented.
The most significant effort of equipping the rotational force was not configuring TAT equipment but, instead, optimizing the KEES.
Hindi mabuti at hanggang ngayon mayroon pa ring rotational brownout sa maraming lugar sa Mindanao dahil sa kulang ang tubig; kulang ang lakas ng tubig sa Napocor, he told Radyo Veritas.
Turnell And Odell's Production Director, Kevin Rees, says Edgecam makes the task of machining rotational mould tools' particularly complex features an easy process.
In 2010 Rotational Engineering secured PS75,000 investment from the Finance for Business North East Growth Fund, through NEL Fund Managers.
For more information about the Rotational Penetrometer and outdoor surfaces, please visit the US Access Board Website and review the published research under the “Exterior Surfaces” header at http://www.
studied the relationship between the use of the rotational staffing model and the monitoring ability of the internal audit function, as measured by two organizational factors: 1) the risk that the financial results presented in the financial statements contained misleading or fraudulent representations, and 2) executive compensation (Margaret Christ, Adi Masli, Nathan Sharp, and David Wood, working paper, Brigham Young University, 2013).
Rotational changes occur due to reaction torques on the nucleus caused by outgassing as a comet approaches the Sun.
2011a), was selected to verify the functionality of the S-5-5R rotational sensors in the field conditions.