Nutation
Related Category: Astronomy: General
in astronomy, a slight wobbling motion of the earth's axis.
Nutation
Rotation (green), Precession (blue) and Nutation in obliquity (red) of the Earth ...
nutation
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Nutation is a slight irregular motion (etymologically a "nodding") in the axis of rotation of a largely axially symmetric object, such as a gyroscope
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Nutation
Nutation is the short-period oscillations in the motion of the pole of rotation of a freely rotating body that is undergoing torque from external gravitational forces.
nutation: a small periodic (principal time constant of 18 years 220 days) oscillation of the rotational axis of the Earth about its mean position. Discovered by James Bradley in 1748.
NUTATION - Nodding motion of the earth's pole superposed on the slow precession.
Nutation -- A small nodding motion in a rotating body. Earth's nutation has a period of 18.6 years and an amplitude of 9.2 arc seconds.
Nutation
(a) Slight but recurrent oscillation of the axis of the Earth, caused by the Moon's minutely greater gravitational effect on the Earth's equatorial "bulge".
Nutation. A slow 'nodding' of the Earth's axis due to the gravitational tug of the Moon on the Earth's protuberant equator.
O ...
period of moon's node See nutation, note. period scrams Electronic safety circuits that automatically insert safety rods in a reactor when the reactor period decreases below the safe minimum limit.
The only other problem of any significance has been a nutation-like motion which built up following deployment of the 7.5-meter (25-foot) axial radio wave experiment antenna shortly after launch.
However, the tilt does undergo a slight, irregular motion (known as nutation) with a main period of 18.6 years.
Precession of a spinning scientific payload (also known as its "coning"--from "cone"--or its "nutation") is an unwelcome feature, because it complicates the tracking of its instruments.
It is affected by the motions of Precession and Nutation, of which the former has been known since the time of Hipparchus.
The reference pole for nutation and polar motion; the axis of figure for the mean surface of a model Earth in which the free motion has zero amplitude.
Like the Tropic of Cancer, the Tropic of Capricorn moves over the surface of the earth due to precession and nutation. Simply put, the tilt of the axis of the Earth varies in time, at time scales varying between days and 41,000 years.
This data provided precise information on the relative orbital positions of Earth and Mars and on the rotation of Mars, in particular the secular precession of the longitude of the node, the short period nutation of the obliquity and the node, ...
The stellar movement proved too insignificant for his telescope, but he instead discovered the aberration of light and the nutation of the Earth's axis.
In addition to these primary motions, three other components of the total motion of the earth exist: the precession of the equinoxes, nutation (periodic variation in the inclination of the earth's axis caused by the gravitational pulls of the sun and ...
6 years (nutation). Besides these wobbles, there are more complicated gravitational effects due to the fact that the Earth is not rigid and deforms under the attraction of the Sun and Moon (tidal deformation).
3 days have been deduced by different methods. Both may exist, one of them involving a tumbling motion, or nutation, that results from the irregular shape of the nucleus, which has two quite different moments of inertia along perpendicular axes.
progressive motion (resulting in a full circle in about 25,700 years) the Sun and Moon also cause small periodic variations, due to their changing positions. These oscillations, in both precessional speed and axial tilt, are known as the nutation.
Precession is considered a secular variation, arising from the motions of the mean equator and the mean ecliptic. Compare this with periodic variations, which are rather rapid changes; nutation is a periodic variation.
orbit causes Earth's rotation axis to wobble slightly, changing the angle between Earth's axis and the ecliptic by plus or minus 9 arcseconds every 18.6 years. This additional motion, which is superimposed on Earth's precession, is known as nutation.
 See also: Earth, Period, Orbit, Axis, Planet
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