Rotation

Rotation of a planar figure around a point Mathematically, a rotation is a rigid body movement which, unlike a translation, keeps a point fixed.

Rotation Curve Galactic rotation curves plot a galaxy's circular velocity (which can be measured using the of of the trailing and leading sides as viewed from the Earth) vs. the distance from the center of rotation.

Rotational motion is described by the Euler equation, which can be written dL/dt=N, where L is the angular momentum, N is the torque, and d/dt is the time derivative (the instantaneous rate of change).

Moment of rotation. See Moment of inertia, under Moment. -- Rotation in office, the practice of changing public officers at frequent intervals by discharges and substitutions.

Definition: rotation: The turning or spinning of a body about an axis running through it. Space Tragedies9 Planets in Nine DaysAstronomy 101 Related Articles ...

Rotation a.k.a. Chicago - Pool & Billiards Games - Rotation With its potentially lengthy contest, Rotation was the darling of most pool shooters up through the Depression era and WWII. This classic game deserves a second look.

The time for the Moon to go around the Earth is exactly equal to the time it takes the Moon to rotate on its axis. This "locking" of periods between revolution (going around the parent body) and rotation is common throughout the Solar System.

Differential rotation is seen if parts of a rotating object move with different angular velocity. (to put it short and non-scientific, parts at different distances from the rotation axis make a different number of rounds at a given time interval).

Rotation rate. Photographs relayed by the Mariner 10 spacecraft showed that Mercury spins on its axis (rotates) once every 58.646 Earth days, exactly two-thirds of the orbital period of 87.9694 Earth days.

Solar Rotation The Sun rotates around an axis which is roughly perpendicular to the plane of the ; the Sun's rotational axis is tilted by 7.25° from perpendicular to the ecliptic.

axial rotation The spin of an object around its axis. Related category - CLASSICAL MECHANICS ...

Earth's rotational axis points in the same direction relative to the stars, so that the North Pole points towards the star Polaris. Think of the Earth as a spinning top, tipped over to one side.

The Sun's rotation period varies with latitude on the Sun since it is made of gas. Equatorial regions rotate faster than polar regions. The equatorial regions (latitude = 0 degrees) rotate in about 25.6 days.

Rotation in office, or term limits, dates back to the American Revolution, and prior to that to the democracies and republics of antiquity.

Rotation curves: As discussed in the disk-dynamics section, real disk galaxies show flat rotation curves which require a density distribution approximately scaling as 1/R, ...

Rotational Behaviour Since Saturn does not rotate on its axis at a uniform rate, two rotation periods have been assigned to it, like in Jupiter's case: System I has a period of 10 h 14 min 00 s (844.3°/d) and encompasses the Equatorial Zone, ...

Rotation. The Milky Way rotates around an axis joining the galactic poles. Viewed from the north galactic pole, the rotation of the Milky Way is clockwise, and the spiral arms trail in the same direction.

Rotation and Revolution "Rotation" refers to an object's spinning motion about its own axis. "Revolution" refers the object's orbital motion around another object. For example, Earth rotates on its own axis, producing the 24-hour day.

rotation curve A graph of orbital velocity versus orbital radius of stars in the galaxy. rotation curve method ...

Rotation period (length of day in Earth days) 0.72 (17.9 Earth hours)(retrograde) Revolution period (length of year in Earth days) ...

Rotation curve : rapid rise, then constant (at ~200 km/s) differential rotation (inner stars overtake) dark matter extends beyond stars (unknown) ...

Rotational period: The time it takes for a planet to rotate once on its axis, with respect to the stars (not the Sun.) Except for Mercury and Venus, this is comparable with what we would call its day.

Rotation Earth Movie. Earth's Lights at Night. Earth Topography Animation. Aurora Video. Earth/Venus Rotation Movie. Galileo Earth Encounter. Earth: The Movie - Animation of Clouds & Flight. Earth: The Movie - Animation of Clouds.

rotation Spinning motion of a body about an axis. rotation curve Plot of the orbital speed of disk material in a galaxy against its distance from the galactic center.

Rotational symmetry without pronounced spiral or elliptical structure E Elliptical ...

Rotation of the plane of polarization of linearly polarized radiation when the radiation passes through a plasma containing a magnetic field having a component in the direction of propagation. Feautrier's Method ...

Rotation The spin of an object around its central axis. Earth rotates about its axis every 24 hours. A spinning top rotates about its center shaft. Satellite ...

ROTATION The spinning of an object on its axis. S SATELLITE An object that revolves around a larger primary body.

rotation the spin of a galaxy, star, planet, moon, or asteroid about a central axis rotation period ...

ROTATIONAL PERIOD A rotational period is the time that it takes a planet, moon or other orbiting body to turn once around its axis - one "day".

Rotation The spin of a body about its axis. S Satellite A natural or artificial body in orbit around a planet.

Rotation Curve A graph of orbital velocity versus radius in the disk of a galaxy. RR Lyrae Variable ...

Rotation the spin of a body about its axis. Rupes the term applied to scarps on planetary surfaces; many scarps are thought to be the surface expression of faults within the crust of the planetary object.

rotation axis -- an imaginary line through the center of a body about which the body spins. rotation curve -- a plot of the rotation velocity of the stars or gas in a galaxy at different distances from its center.

Rotation Curve: A plot of the orbital velocity in the disk of a galaxy versus the radius from the center of the galaxy. This curve can then be used to obtain the mass within a given radius (by using Kepler's laws for orbital dynamics).

Rotation Curve - A plot of the speed of revolution of the stars and gas in a galaxy versus distance from the center of the galaxy RR Lyrae Star - A member of a class of giant pulsating stars, all of which have pulsation periods of about 1 day ...

Rotation axis of the Earth -- The imaginary line around which the Earth turns. Its inclination of about 23.5o to the ecliptic is the reason for the seasons of the year.

A rotation curve is a plot of speed versus distance from the center of an astronomical system.

La rotation du Soleil Le mouvement du Soleil dans le ciel Réalisation d'un (gros) cadran solaire L'éducation interactive de la SCA : vos commentaires ...

The rotation periods and shapes of asteroids are determined primarily by monitoring their changing brightness on timescales of minutes to days.

The rotation of Mercury, which makes three complete rotations on its axis for every two complete orbits around the Sun. A ring ...

The rotation curve can be determined by looking at the doppler velocities of hydrogen gas along different lines of sight.

The Rotation Period for each planet is the period relative to the stars. This is slightly different from the period relative to the Sun, which for the Earth we call the day.

The rotation of the planets on their axes is also explained as a consequence of the nebular theory, for at the time of the first formation of the planet it must have participated in the rotation of the whole nebula, ...

[4.0] Rotational Motion [4.1] ROTATIONAL MOTION / ANGULAR VELOCITY [4.2] FUNDAMENTAL QUANTITIES / CENTER OF MASS ...

Rapid rotation flattens Regulus. Ken Croswell Some stars spin so fast they're actually flattened, such as Regulus in Leo. Achernar in Eridanus is the flattest star known. Astronomy: Roen Kelly [View Larger Image] ...

Solar Rotation Rate. The rate at which the Sun rotates on its axis. The rotation rate varies with latitude (called differential rotation).

Venus' rotation is somewhat unusual in that it is both very slow (243 Earth days per Venus day, slightly longer than Venus' year) and retrograde.

Mars's rotation produces a day just a little longer than an Earth day. However, it's more distant orbit around the Sun takes almost two Earth years and is also significantly elliptical ("eccentric").

Faraday rotation: Rotation of an electromagnetic wave's polarization as it passes through a magnetic field parallel to the propagation of the wave in a medium.

Sidereal Rotation Period (Magnetic Coordinates, determined by Voyager 2 Radio Science Experiment) 16.11 hours Synodic Period ...

The rapid rotation of these planets stretches the clouds that top their atmospheres into globe-encircling bands.

synchotron rotation - (n.) A situation in which the rotational and orbital periods of an orbiting body are equal, so that the same side is always facing the companion object. synergistic effect - (n.) ...

Synchronous rotation- said of a satellite if the period of its rotation about its axis is the same as the period of its orbit around its primary; this implies that the satellite always keeps the same hemisphere facing its primary (e.g. the moon); ...

Differential rotation. The rotation of a body such as a gaseous planet or the Sun so that different parts are rotating at different speeds. For example, a star or planet which rotates faster at its equator than it does at its poles.

If the Earth's rotational axis were perpendicular to the plane of Earth's orbit around the Sun, the Sun would always rise due east and set due west every day of the year everywhere on Earth.

We know that the rotation of the earth about its axis causes day and night. The part of the earth, which faces the sun, has day, and remaining part has night.

precession: Slow rotation of an angle that defines the orientation of the orbit in space.

Due to the earth's rotation, the moon appears to rise in the east and set in the west, like all other heavenly bodies; however, the moon's own orbital motion carries it eastward against the stars.

During shore leave rotations while the Enterprise-A was brought up to working condition, Sulu and Chekov decided to take their leave together and go on a hiking trip.

See also: Earth, Sun, Solar, Orbit, Light