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	Earth Nutation Visualized
		Nutation is a small cyclical motion superimposed upon the steady 26,000-year precession of the Earth's axis of rotation.
		It is mainly caused by the gravitational effect of the 18.6-year rotation period of the Moon's orbit.
		Nutation graphed here is divided into components along (longitude) and perpendicular (obliquity) to the ecliptic -- not the Earth's equator.
	www.pietro.org /Astro_Util_StaticDemo/MethodsNutationVisualized.htm (306 words)

	GKM Siebtechnik GmbH: 25 ans d'experience en tamisage Tamiseurs à nutation et vibrants (Site not responding. Last check: 2007-10-26)
		GKM Siebtechnik GmbH: 25 ans d'experience en tamisage Tamiseurs à nutation et vibrants
		Le design de notre marque dont les avantages sont reconnus par nos clients domine les axes de développement a venir et les prochaines années seront caractérisées par la recherche constante d’innovations techniques.
		Avec 25 ans d’expérience dans le domaine du tamisage et des techniques du secteur, nous sommes un des leaders dans la fabrication de tamiseurs a nutation, tamiseurs vibrants circulaires et tamiseurs de laboratoire a jet d’air avec de nombreuses références de succès dans toutes les industries.
	www.gkm-net.de /fr/entreprise.php (189 words)

	Curious About Astronomy: What is the difference between nutation and precession of the Earth?
		What is the difference between nutation and precession of the Earth?
		Isaac Newton, and others since his day, have shown that the Earth's precession is caused by the gravity of the Moon and Sun acting on the oblateness of the Earth.
		Ask an Astronomer is hosted by the Astronomy Department at Cornell University and is produced with PHP and MySQL.
	curious.astro.cornell.edu /question.php?number=545 (484 words)

	What is Nutation ? (Site not responding. Last check: 2007-10-26)
		Nutation is, in astronomy, a small irregularity in the precession of the equinoxes.
		Nutation (Latin nutare, "to nod") superimposes a small oscillation, with a period of 18.6 years and an amplitude of 9.2 seconds of arc, upon this great slow movement.
		The cause of nutation lies chiefly in the fact that the plane of the Moon's orbit around the Earth is tilted by about 5º from the plane of the Earth's orbit around the Sun.
	www.nutation.org (132 words)

	Nutation - Biocrawler (Site not responding. Last check: 2007-10-26)
		Nutation is a slight irregular motion (etymologically a "nodding") in the axis of rotation of a planet, due to the fact that the tidal forces which cause precession of the equinoxes vary over time so that the speed of precession is not constant.
		These items are affected both by precession of the equinoxes and nutation, and thus depend on the theories applied to precession and nutation, and on the date used as a reference date for the coordinate system.
		In simpler terms, nutation (and precession) values are important in observation from Earth for calculating the apparent positions of astronomical objects.
	www.biocrawler.com /encyclopedia/Nutation (460 words)

	The Dispatch - Serving the Lexington, NC - News (Site not responding. Last check: 2007-10-26)
		Nutation is a slight irregular motion (etymologically a "nodding") in the axis of rotation of a largely axially symmetric object, such as a gyroscope or a planet.
		The nutation of a planet is due to the fact that the tidal forces which cause the precession of the equinoxes vary over time so that the speed of precession is not constant.
		The principal term of nutation is due to the regression of the moon's nodal line and has the same period of 6798 days (18.6 years).
	www.the-dispatch.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=nutation (591 words)

	Fiber-based free-space optical system - Patent 5062150
		The nutation may be accomplished by radial electromagnetic, piezoelectric, or electrostatic mechanical displacement of a tip of the optical fiber, the tip being located in a focal plane of a focusing element.
		Nutation driver circuit 100 includes a dither generator 102 and a power amplifier 104, which, in a simplified embodiment of the present invention, can apply a constant amplitude signal (such as a sine wave) to the nutation driver circuit (magnets 38, 40 and respective coils 42, 44).
		In the preferred embodiment, the nutation driver circuit 100 is configured to compensate for any drift in the characteristics of coupler 34 to ensure that fiber core 20 oscillates in a circular manner at the desired frequency (which in the case of the resonant fiber nutator is at or near the mechanical resonance).
	www.freepatentsonline.com /5062150.html (5459 words)

	nutation - Encyclopedia.com (Site not responding. Last check: 2007-10-26)
		nutation in astronomy, a slight wobbling motion of the earth's axis.
		The causes of nutation are similar to those of the precession of the equinoxes, involving the varying attraction of the moon on the earth's equatorial bulge.
		However, the period of the motion is only 18.6 years, the same as that of the precession of the moon's nodes, as opposed to the nearly 26,000-year period of the precession of the equinoxes.
	www.encyclopedia.com /doc/1E1-nutation.html (346 words)

	NUTATION DRIVE
		The nutator carries radially mounted conical camrollers that engage between cams on the rotor and stator.
		Nutation is imparted to the nutator through the center support bearing by the fixed angle of its mounting on the input shaft.
		During nutation the nutator is held from rotating by the stator, which transmits the reaction forces to the housing.
	cvt-ivt.tripod.com /forum/id8.html (270 words)

	The AS Ilium Fixation, Nutation, and Respect \| Joseph D. Kurnik, DC
		Nutation, as described by Kapandji, is the anterior inferior motion of the sacral base.
		This nutation and counter-nutation motion of the sacrum is a pivoting type of motion, so that when the base moves forward, the sacral apex (inferior part of the sacrum) moves posteriorly.
		According to nutation principles, this process does render support to the lower lumbar region, that is, the process of creating a bilateral AS fixation.
	www.chiroweb.com /archives/14/26/18.html (3255 words)

	Precession and Nutation
		It is a common misconception that precession is caused by the Sun and nutation is caused by the Moon.
		In fact the Moon is responsible for two-thirds of the precession, and, while it is true that much of the complex detail of the nutation is a reflection of the intricacies of the lunar orbit, there are nonetheless important solar terms in the nutation.
		The models for precession and nutation come from a combination of observation and theory, and are subject to continuous refinement.
	www.hartrao.ac.za /nccsdoc/slalib/sun67.htx/node203.html (744 words)

	VT Physics Lecture Demo M90
		As the top spins slower, the length of the nutation cycle increases and the precession rate is faster.
		As the top spins faster, the precession rate is slower and the amplitude and period of the nutation cycle both decrease.
		The nutation may be inhibited by careful hand adjustment of the axle or it may be enhanced by giving the axle tip a push.
	www.phys.vt.edu /~demo/demos/m90.html (165 words)

	PmWikiFisica \| NMR / Classical Nutation browse
		A consideration on the name: nutation is more generally known as the small amplitude, wobbling motion of the Earth axis, in its 25700 year long precession around the north ecliptical pole.
		The motion is the same, the difference being that for the Earth the oscillatory perturbation (being due to the non collinearity of the angular momentum and the principal axes of the Earth moment of inertia) is non resonant with the main Larmor frequency.
		The different appearance of nutation close and far from resonance are also illustrated by the monochromats in the numerical simulation of the nutation, (Fig.
	www.fis.unipr.it /~derenzi/dispense/pmwiki.php?n=NMR.ClassicalNutation (638 words)

	Highbeam Encyclopedia - Search Results for nutation
		However, the period of the motion is only 18.6 years, the same as that of the...
		nutation The Concise Oxford Dictionary of English Etymology...
		nutation Oscillating movement (period 18.6 years) superimposed on the steady precessional movement of the Earth's axis so that the precessional path of each celestial pole on the celestial sphere follows an irregular rather than a true circle.
	www.encyclopedia.com /SearchResults.aspx?Q=nutation (498 words)

	The Fredericks Company - Nutation Dampers: Vibration Suppressing Devices
		Nutation dampers are used to dampen the undesirable set of forces correspondent with spinning bodies known collectively as “nutation.” This nutation, or wobble, when not properly dampened, causes erratic behavior of the spinning body.
		Glass nutation dampers are fabricated with customer-specified single or multiple races that contain a finite amount of appropriate high-density liquid.
		Metal nutation dampers are manufactured with single and dual races with customer-specified race height, width parameters, and fluid fill weights.
	www.frederickscom.com /products/nutation.html (136 words)

	SwRI Spring 2001 Technology Today Article
		Sloshing produces forces and torques that accentuate the spacecraft nutation and are the main cause of excessive nutation.
		The magnitude of the nutation is measured by the cone angle, which is the angle between the actual direction of the spacecraft's spin axis and its desired direction (to be precise, the direction of its angular momentum vector); in effect, the spacecraft is tilted slightly with respect to its desired flight direction.
		The sum of the rotational rates of the upper and lower pulleys is equal to the spacecraft spin rate (neglecting the small effect of the upper frame tilt), and the nutation frequency (that is, the frequency of the tank's up-and-down, to-and-fro motion) is equal to the rotational rate of the upper motor pulley.
	www.swri.edu /3pubs/ttoday/Spring01/Spin.htm (1458 words)

	Magnetic Resonance TIP - MRI Database : Nutation
		A displacement of the axis of a spinning body away from the simple cone-shaped figure, which would be traced by the axis during precession.
		In the rotating frame of reference, the nutation caused by a RF pulse appears as a simple precession, although the motion is more complex in the stationary frame of reference.
		It is the angle to which the net magnetization is rotated or tipped relative to the main magnetic field direction via the application of a RF excitation pulse at the Larmor frequency.
	www.mr-tip.com /serv1.php?type=db1&dbs=Nutation (315 words)

	SwRI Spring 2001 Technology Today Article
		Sloshing produces forces and torques that accentuate the spacecraft nutation and are the main cause of excessive nutation.
		The magnitude of the nutation is measured by the cone angle, which is the angle between the actual direction of the spacecraft's spin axis and its desired direction (to be precise, the direction of its angular momentum vector); in effect, the spacecraft is tilted slightly with respect to its desired flight direction.
		The sum of the rotational rates of the upper and lower pulleys is equal to the spacecraft spin rate (neglecting the small effect of the upper frame tilt), and the nutation frequency (that is, the frequency of the tank's up-and-down, to-and-fro motion) is equal to the rotational rate of the upper motor pulley.
	www.bioengineering.swri.org /3pubs/ttoday/Spring01/Spin.htm (1458 words)

	nutation
		The chief cause of nutation is the Moon moving in an orbit that is inclined (by 5°) to the ecliptic.
		This lunar nutation amounts to a +/- 9" back-and-forth jiggling of Earth's poles every 18.6 years (the time it takes for the Moon's orbit to walk around to the same relative position again).
		The net result is that, instead of describing a perfectly circular path in the sky, every 25,800 years or so, due to precession, the precessional path of Earth's axis is more like the crinkly shape of a cooky-cutter.
	www.daviddarling.info /encyclopedia/N/nutation.html (180 words)

	IAG/IUGG WG on Non Rigid Earth Nutation Theory
		The last nutation model adopted by the IAU (International Astronomical Union) in 1980 is the nutation series built, on the one hand, on Wahr's transfer function for the nutations of an oceanless elastic Earth (Wahr, 1981), and on the other hand, on Kinoshita's rigid-Earth precession-nutation series (Kinoshita, 1977; Kinoshita et al., 1979).
		The model is the next generation of Wahr's nutation model (it uses an upgraded version of the same program) but still suffers from a lack of dissipation in the core with associated lack of Free Core Nutation (FCN) damping (remaining difference in the out-of-phase part of the retrograde annual nutation of about 0.4 mas.
		The theoretical nutation amplitudes are obtained from a dynamical system of four coupled linear differential equations, and a least-quares fit to nutation amplitudes is determined using VLBI.
	www.gfy.ku.dk /~iag/Travaux_99/sec5_NRENT.htm (2469 words)

	smylie
		Nutation series from the United States Naval Observatory (USNO) were extracted from the file usn2002c.eops obtained by anonymous ftp (ftp://cddisa.gsfc.nasa.gov/vlbi /ivsproducts/eops).
		Since, in the Earth frame, the free core nutations are closely rigid-body rotations of the outer fluid core with respect to a nearly stationary mantle at close to a retrograde diurnal period, their ring downs, in combination with simple Ekman boundary layer theory, provide direct measures of viscosity at the top of the core.
		While the free core nutations have now rung down to nearly unobservable levels, at the outset of the observations in 1979, the newly observed Prograde Free Core Nutation, predicted by Jiang (1993), had an amplitude in the GSFC data as high as 62% of the dominant RFCN.
	ivs.nict.go.jp /mirror/publications/gm2004/smylie/smylie.html (2871 words)

	Physiology of Movements in Stems of Seedling Pisum sativum L. cv. Alaska : I. Experimental Separation of Nutation from ...
		Gravitropism and nutation in the stems of dark-grown, seedling
		as the cause of nutation in pea stems.
		nutational curvature at which gravitropic induction is begun.
	www.plantphysiol.org /cgi/content/abstract/70/1/264 (394 words)

	ROB : WG : Non-Rigid Earth Nutation Theory
		Since there are large differences between the IAU 1980 adopted nutation theory and the observed series of nutation, a WG has been created in 1994 of which to task was to evaluate the possibilities of building a new geophysical nutation theory, a new "non-rigid Earth nutation theory".
		Establishes an inter-commission Working Group on the non-rigid Earth Nutation Theory to be organized by the Presidents of Commissions 4, 7 and 19, under the leadership of V. Dehant, and Invites the IUGG to join the IAU in sponsoring this Working Group in order to form a joint IAU/IUGG Working Group on this topic.
		(1) the input seismic model, (2) the Earth's transfer function, (3) the rigid Earth nutations (4) the convolution between the non-rigid Earth's transfer function and the rigid Earth nutations, and (5) the additional corrections for ocean and atmosphere effects on the nutations.
	www.astro.oma.be /D1/EARTH_ROT/wgnut.html (397 words)

	SJSU Spartnik Microsatellite --
		To control nutation about the z-axis of the spacecraft, a nutation damper will be mounted perpendicularly to the Z-axis of the satellite.
		The nutation damper is a hollow ring that will be filled with a predetermined amount of fluid, with room left for “sloshing”.
		To control nutation about the z-axis of the spacecraft, a nutation damper hoop will be mounted parallel to the xy-plane of the satellite.
	www.engr.sjsu.edu /spartnik/adac.html (2227 words)

	Amazon.com: nutation (Site not responding. Last check: 2007-10-26)
		Mathematical tracts on the lunar and planetary theories, the figure of the earth, precession and nutation, the calculus of variations, and the undulatory theory of optics.
		Mathematical tracts on physical astronomy, the figure of the earth, precession and nutation, and the calculus of variations.
		A redevelopment of the theory of nutation by Edgar W Woolard (Unknown Binding - 1953)
	www.amazon.com /s?ie=UTF8&keywords=nutation&tag=lexico&index=blended&link_code=qs&page=1 (425 words)

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