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Observations of Luni-Solar and Free Core Nutation

Published online by Cambridge University Press:  12 April 2016

Dennis D. McCarthy  and
Brian J. Luzum
Dennis D. McCarthy
Affiliation:
U. S. Naval Observatory Washington, DC 20392USA
Brian J. Luzum
Affiliation:
U. S. Naval Observatory Washington, DC 20392USA

Abstract

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An analysis of the differences between observed nutation angles and the 1980 IAU Nutation Theory shows the existence of currently unmodeled effects. An empirical set of corrections to the 1980 IAU Nutation Theory is presented and compared with current geophysical models. A prograde periodic variation (period ≈ 420 days), which may be related to the theoretical free core nutation, is apparently seen.

Type
Part 2. Poster Papers
Information
International Astronomical Union Colloquium , Volume 127: Reference Systems , 1991 , pp. 303 - 308
Copyright
Copyright © United States Naval Observatory 1991

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