Measurable nutations cycle in as little as 6 days . & mdash; Lomn 23 : 51, 6 February 2008 ( UTC)
22.
The effect of precession and nutation causes this frame of reference itself to change over time, relative to an arbitrary fixed frame.
23.
Because the dynamic motions of the planets are so well known, their nutations can be calculated to within arcseconds over periods of many decades.
24.
The physics of nutation in tops and gyroscopes can be explored using the model of a " heavy symmetrical top " with its tip fixed.
25.
Nutation is the smaller amplitude shorter-period ( < 18.6 years ) wobble that is superposed on the precessional motion of the Celestial pole.
26.
The maximum radius of this ellipse is approximately 9.2 arcseconds, a figure which is known as the " constant of nutation ".
27.
There are also subdivisions into " mean of date " coordinates, which average out or ignore nutation, and " true of date, " which include nutation.
28.
There are also subdivisions into " mean of date " coordinates, which average out or ignore nutation, and " true of date, " which include nutation.
29.
Precession, nutation, and intrinsic rotation ( spin ) are defined as the movements obtained by changing one of the Euler angles while leaving the other two constant.
30.
At first it becomes clear that the Earth's Nutation has been altered by 11 degrees, altering the climatic zones and changing the pole and the equator.
