Rotation
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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
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For objects that are not spherically symmetrical, the rotation period is in general not fixed, even in the absence of gravitational or tidal forces.
axial rotation
The spin of an object around its axis.
Related category
- CLASSICAL MECHANICS ...
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.
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.
The Earth's rotation axis is not fixed in space. Like a rotating toy top, the direction of the rotation axis executes a slow precession with a period of 26,000 years (see following figure). Pole Stars are Transient ...
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).
Differential Rotation
In a rotating solid body, regions that are adjacent at one point in time will remain adjacent as the body rotates. This means that points further from the rotation centre will travel at greater speeds than those closer in.
Definition: 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.
ROTATION RATE
The same clouds whose reflectivity makes Venus so easy to see in the night sky also make it impossible for us to discern any surface features on the planet, at least in visible light.
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, ...
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 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.
rotation
the spin of a galaxy, star, planet, moon, or asteroid about a central axis
rotation period ...
Rotational Motion
Even though we can still only resolve most stars as point sources they are in fact large, roughly spherical balls of hot gas and plasma. Stars rotate, that is they spin on their axis.
ROTATION
The spinning of an object on its axis.
S
SATELLITE
An object that revolves around a larger primary body.
ROTATION2 - Turning of an astronomical object on its axis.
ROTATION CURVE - Plot showing how orbital velocity (V) varies with distance from the centre of an object (R).
Rotation Curve
A quantitative description of how fast each part of a galaxy is rotating about the center. A rotation velocity is the velocity of a rotating galaxy at a certain distance from the center of the galaxy.
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 of ammunition is a term used with reference to guns.Projectiles intended for R.M.L. guns were at first fitted with a number of gunmetal studs arranged around them in a spiral manner corresponding to the twist of rifling....
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.
Rotation and shape
The rotation periods and shapes of asteroids are determined primarily by monitoring their changing brightness on timescales of minutes to days.
[4.0] Rotational Motion
[4.1] ROTATIONAL MOTION / ANGULAR VELOCITY
[4.2] FUNDAMENTAL QUANTITIES / CENTER OF MASS ...
Solar Rotation Rate. The rate at which the Sun rotates on its axis. The rotation rate varies with latitude (called differential rotation).
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.
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) ...
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.
Rotational symmetry without pronounced spiral or elliptical structure
E
Elliptical ...
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 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. [H76]
Feautrier's Method ...
Rotation
The spin of a body about its axis.
S
Satellite
A natural or artificial body in orbit around a planet.
The rotation rates of planets like Earth are well known because they have solid surfaces on which there are fixed landmarks from which the rate at which they spin can be recorded.
The rotation of a body in which different parts of the body have different periods of rotation. This is true of the Sun, the Jovian planets, and the disk of the galaxy.
differentiation
The separation of planetary material according to density.
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 period of Neptune's magnetic field, which astronomers had guessed would follow the rotation of the planet's core, was found by Voyager 2 to be 16.11 hours.
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, ...
The rotation of the core generates the magnetic field of the Earth. The magnetic axis does not coincide with the spin axis and it does not pass through the Earth's center.
The rotation axis of the Earth describes over a period of about 25800 years a small circle (blue) among the stars, centred around the ecliptic northpole (blue E) and with an angular radius of about 23.
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".
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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").
Period of rotation (w/ respect to the Sun)
24h 00m 00s
Inclination of equator to orbit ...
The rapid rotation of these planets stretches the clouds that top their atmospheres into globe-encircling bands.
The rapid rotation and strong magnetic field of a pulsar can generate a wind of high-energy matter and antimatter particles that rush out at near the speed of light.
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
Phrase describing when a planet's moon takes the same amount of time orbiting the planet as it does spinning. This means the same side always faces the planet.
T ...
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.
differential rotation--The difference in the pace of rotation between the polar and equatorial regions on the Sun
disk--The surface of the Sun as it is seen in the sky
electric field--The forces in action between two charged objects ...
differential rotation
A rotational property of gaseous objects, where the equatorial regions rotate at a faster rate than the polar regions.
disk ...
 See also: Earth, Sun, Solar, Orbit, Light
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