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nutation
[ noo-tey-shuhn, nyoo- ]
noun
- an act or instance of nodding one's head, especially involuntarily or spasmodically.
- Botany. spontaneous movements of plant parts during growth.
- Astronomy. the periodic oscillation observed in the precession of the earth's axis and the precession of the equinoxes.
- Mechanics. the variation of the inclination of the axis of a gyroscope to the vertical.
nutation
/ ːˈٱɪʃə /
noun
- astronomy a periodic variation in the precession of the earth's axis causing the earth's poles to oscillate about their mean position
- physics a periodic variation in the uniform precession of the axis of any spinning body, such as a gyroscope, about the horizontal
- Also calledcircumnutation the spiral growth of a shoot, tendril, or similar plant organ, caused by variation in the growth rate in different parts
- the act or an instance of nodding the head
nutation
/ Դ̅̅-′ə /
- A small, cyclic variation of the Earth's axis of rotation with a period of 18.6 years, caused by tidal forces (mostly due to the gravity of the Moon). Nutation is a small and relatively rapid oscillation of the axis superimposed on the larger and much slower oscillation known as precession . Although discovered in 1728 by the British astronomer James Bradley (1693–1762), nutation was not explained until two decades later.
- A slight curving or circular movement in a stem, as of a twining plant, caused by irregular growth rates of different parts.
Derived Forms
- ԳˈٲپDzԲ, adjective
Other yvlogs From
- Գ·ٲtDz· adjective
yvlog History and Origins
yvlog History and Origins
Origin of nutation1
Example Sentences
Mathews, P. M., Herring, T. A. & Buffett, B. A. Modeling of nutation and precession: new nutation series for nonrigid Earth and insights into the Earth’s interior.
Even the tides and precession of the equinoxes and Bradley's nutation were accounted for and explained.
Commonly this nutation is slight or hardly observable.
Either it may point to a different star, remaining fixed relatively to the earth, as in the nutation which Bradley discovered; or it may actually change its position in the earth.
This angle of tilt may be assumed to be constant, for I won't bother with the precessions, nutations and other minor movements considered in accurate computations.
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