nutation | engleski leksikon

1. nutation

imenicaarhaično, zastarelo

The act of nodding the head

nutation | engleski leksikon

2. nutation


In botany, the spiral movement exhibited by the tips of certain stems during growth; it enables a climbing plant to find a suitable support. Nutation sometimes also occurs in tendrils and flower stalks.
The direction of the movements, clockwise or counterclockwise, is usually characteristic for particular species.

nutation | engleski leksikon

3. nutation


Fluctuation or nodding in movement of earth's pole.
In astronomy, a slight “nodding” of the Earth in space, caused by the varying gravitational pulls of the Sun and Moon.
Nutation changes the angle of the Earth's axial tilt (average 23.5ş) by about 9 seconds of arc to either side of its mean position, a complete cycle taking just over 18.5 years.

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