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nutation
nutation
nutation A periodic oscillation of the Earth's pole about its mean position on the celestial sphere, due to the attractions of the Sun and Moon on the Earth's equatorial bulge. It causes a small periodic variation in the positions of stars, and is superimposed on the much larger effect of precession. The main oscillation has an amplitude of about ±9ʺ and a period of 18.6 years, equal to the revolution period of the Moon's nodes around the ecliptic. In addition there are many smaller oscillations, some with periods as small as a few days. Nutation is conventionally resolved into
nutation in longitude and
nutation in obliquity, which are respectively parallel and perpendicular to the ecliptic.
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Ethylene Stimulates Nutations That Are Dependent on the ETR1 Receptor1[W][OA]
Magazine article from: Plant Physiology; 12/1/2006; ; 700+ words
; ...ethylene stimulates nutations of the hypocotyls with...onset of over 6 h. The nutation response was constitutive...ethylene-stimulated nutations, but the ETR1 receptor...receptor isoforms in this nutation phenotype. Naphthylphthalamic...ethylene-stimulated nutations but had no effect on...
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Atmospheric Contributions to Earth Nutation: Geodetic Constraints and Limitations of the Torque Approach
Magazine article from: Journal of the Atmospheric Sciences; 2/1/2004; ; 700+ words
; ...the rotation axis known as nutations. Previous studies of these...estimates of atmosphere-induced nutation based on the torque and angular...considered. 1. Introduction Nutations refer to the low-frequency...comparisons between observed nutation and the modeled response of...
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Recent findings from V.S. Gubanov and co-authors highlight research in astrophysics.
Newspaper article from: Physics Week; 5/19/2009; 630 words
; ...perturb the angular momentum of the entire Earth and produce an additional free nutation of the celestial pole called free core nutation (FCN). Since this nutation causes resonances in the diurnal tides and in the expansions of luni-solar nutation...
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Nutating gear drivetrain for a cordless screwdriver.
Magazine article from: Mechanical Engineering-CIME; 1/1/1994; ; 700+ words
; ...Coupling the mathematical concept of nutation with straight bevel gears, a class of...mathematics discovered the concept of nutation almost by accident. He was spinning...peculiar wobble takes place; this wobble is nutation. As a coin wobbles, it traces a circle...
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Report summarizes geophysics study findings from Y. Rogister and co-researchers.
Newspaper article from: Physics Week; 3/3/2009; 700+ words
; ...the Chandler Wobble (CW), Free Inner Core Nutation (FICN) and Free Core Nutation (FCN). The interaction between pseudo-modes...mixed in such a way that the amplitude of the nutation of the inner core is an order of magnitude bigger...
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Sacro-Occipital Technique's "Category Two": A Remedy for Fixated Thinking
Magazine article from: Dynamic Chiropractic; 9/1/2006; ; 700+ words
; ...synovial bed, which allows for the joint nutation and whose motion purportedly aids in...anterior portion associated with normal nutation? see Fig. 1 below The second step is...supersede the need to maintain normal sacral nutation. The treatment of the SI joints involves...
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New clues revealed about Earth's movements.
Newspaper article from: Science Letter; 3/31/2003; 700+ words
; ...recently discovered concerning the Earth's nutation (small variations in the position of...Earth (lunisolar precession) and the nutation, or wobbling, of the Earth's rotation...recently that the amplitude of the Earth's nutation is out of phase with the tidal force...
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Research from S. Rosat and co-researchers provides new data on astrophysics.(Report)
Newspaper article from: Physics Week; 9/22/2009; 620 words
; ...Strasbourg, France, "Free core nutation (FCN) can be observed by its associated resonance effects on the forced nutations of the Earth's figure axis, as...amp; Astrophysics (Free core nutation resonance parameters from VLBI and...
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The hot and the classic
Magazine article from: Plant Physiology; 8/1/2003; ; 700+ words
; ...the percentage of seedlings exhibiting nutation is greatly enhanced by brief gravitropic...the organs migrates basipetally during nutation at approximately the same rate as the...Classic experiments demonstrated that the nutations of grass coleoptiles cease following...
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Hybrid pump design reduces noise and vibration. (Thomas Compressors & Vacuum Pumps' Swob-L pump/compressor)
Magazine article from: Design News; 3/3/1997; ; 700+ words
; ...of rotation intersects the axis of nutation of the eccentric assembly. It also intersects the eccentric's axis of nutation along the plane that passes through...motor shaft's rotation drives the nutation of a plate. Secured to the pistons...
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nutation
Book article from: A Dictionary of Astronomy
nutation A periodic oscillation of the Earth's pole about its mean...oscillations, some with periods as small as a few days. Nutation is conventionally resolved into nutation in longitude and nutation in obliquity , which are respectively...
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nutation in right ascension
Book article from: A Dictionary of Astronomy
nutation in right ascension An alternative name for equation of the equinoxes .
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Earth orientation
Book article from: The Oxford Companion to the Earth
...irregular small-amplitude motion (nutation) at periods of from a few days to 18...time. In addition to the precession and nutation of the Earth's rotational axis, the...system with respect to which precession, nutation, polar motion and the difference between...
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James Bradley
Encyclopedia entry from: Encyclopedia of World Biography
...discovered the aberration of light and the nutation of the earth's axis. James Bradley...work on aberration, Bradley discovered nutation, the oscillation of the earth's axis...equatorial bulge. He concluded that nutation must arise from the fact that the moon...
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Precession of the Equinoxes
Encyclopedia entry from: The Gale Encyclopedia of Science
...precession, constituting an astronomical nutation, with an amplitude 9.2 ˝...x2013; 1762) announced the discovery of nutation in 1748. Astronomical observations of...account for the effects of precession and nutation. The displacement caused by precession...
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