# 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 ?
It has been shown that the impact strengths of rotationally molded polyethylene can be increased by the reinforcement of PC, and this increase provides significant advantages in terms of improved product quality.
In 2001, ALF/TW-R pastures were irrigated four times and the rotationally stocked pastures were watered an average of 3.6 times.
After molding, the impact strengths of rotationally molded parts were measured at room temperature.
From April to June, growth of clipped and rotationally stocked clones was superior to that of continuously stocked clones.
The P-291 shipping container is rotationally molded from a single, seamless piece of high-density polyethylene to deliver strength and durability.
The Poly-Trux 50P series of recycling and utility carts and trucks are outfitted with a proprietary T-nut that creates a seal between the cart's rotationally molded plastic bin and poly-steel base.
Constructed of rotationally molded weatherproof polyethylene in a single piece, each cart holds payloads up to 400 pounds.
Wiltshire-based Leafield Environmental has launched a new, rotationally moulded polyethylene bin that it claims can reduce the volume of used drinking cups by a factor of ten.
Peristalsis rotationally compresses the tubing, causing the condensate to move through it.
Microtaggants are described as microscopic encoded particles designed to be compounded directly into many types of resins to act as "virtual fingerprints" for authenticating injection-molded, extruded, or rotationally molded products.
In reference to common tool and mold making, the production of molds for tire sidewalls shows a peculiarity: The workpieces are rotationally symmetrical.
The spinning machine is used to produce rotationally symmetrical hollow bodies from a circular sheet metal blank by the process principle of pressing according to din 8584-4.

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