This method only provides the position in two coordinates and is more difficult to use than GPS . However, it is useful for measuring motions of the Earth such as nutation and Chandler wobble.
42.
The Chandler wobble is usually considered a resonance phenomenon, a free nutation that is excited by a source and then dies away with a time constant ? D of the order of 100 years.
43.
Another example is problematic interaction with the spacecraft Attitude Control System ( ACS ), especially for spinning satellites which can suffer resonance between slosh and nutation, or adverse changes to the rotational inertia.
44.
Like movements of radial organs, such as stems, cylindrical leaves, and roots, have been termed circumnutation, or revolving nutation, to distinguish them from the simple nutation of dorsiventral organs.
45.
Like movements of radial organs, such as stems, cylindrical leaves, and roots, have been termed circumnutation, or revolving nutation, to distinguish them from the simple nutation of dorsiventral organs.
46.
It is then necessary to apply a further correction to take into account the effect of nutation, after which the position relative to the " true equinox and equator " is obtained.
47.
For objects that are not close to a celestial pole, nutation in right ascension ( \ Delta \ alpha ) and declination ( \ Delta \ delta ) can be calculated approximately as follows:
48.
In the case of the Earth, the principal sources of tidal force are the Sun and Moon, which continuously change location relative to each other and thus cause nutation in Earth's axis.
49.
The telescope was thus rigidly mounted for photographing the polar region only, for the purpose of investigating the wobbling of the axis of rotation of the earth and redetermining the constants of precession and nutation.
50.
"' Precession "'refers to a specific change in the direction of the rotation axis of a rotating object, in which the second Euler angle ( angle of nutation ) is constant
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