Second-order terms in the Earth's nutation

Details Second-order terms in the Earth's nutation Second-order terms in the Earth's nutation

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jsrs.meet..144l&link_type=abstract

In: Journées 2004 - systèmes de référence spatio-temporels. Fundamental astronomy: new concepts and models for high accuracy obs

Astronomy and Astrophysics

Astronomy

1

Earth Nutation

Scientific paper

Given the accuracy of the observations, the effects of the second-order terms in the equations of the Earth's rotation have now to be considered. The effects of the zonal deformations have been considered by several authors (Souchay & Folgueira 1999, Mathews et al. 2002, Lambert & Capitaine 2004) but they are only one effect among several second-order effects. This study investigates these second-order terms. The computation yields an almost complete cancellation of the different contributions so that the net effect of the second-order terms is no more than a few tens of microarcseconds.

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