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Observed and Theoretical Values of the Nutations

Published online by Cambridge University Press:  12 April 2016

R.O. Vicente
R.O. Vicente*
Affiliation:
Dept. Applied Mathematics, Faculty of Sciences, Lisbon, Portugal

Extract

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We are here concerned with the nutations that appear in the motion of the Earth because of the existence of the external forces due to the Sun and Moon, that is, the forced nutations.

We can consider the nutations divided in two groups from the point of view of their values and the precision attained by astronomical observations. The first group comprises the nutations that have values greater than 1″ and in this group we have the nutation of period 18.6 yr called the principal nutation and the value of this nutation in obliquity is called the constant of nutation. The second group comprises the nutations with values smaller than 1″ and corresponds to the great majority of all other nutations.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 9: The IAU System of Astronomical Constants , October 1971 , pp. 186 - 189
Copyright
Copyright © Reidel 1971

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