Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...146..381c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 146, no. 2, May 1985, p. 381-383.
Astronomy and Astrophysics
Astrophysics
14
Astronomical Coordinates, Earth Rotation, Ephemerides, Nutation, Polar Wandering (Geology), Celestial Mechanics, Data Reduction, Diurnal Variations
Scientific paper
The precise meaning and consequences of the introduction beginning in 1984 of the 1980 IAU theory of nutation (Wahr, 1980; Seidelmann, 1982) based on the celestial ephemeris pole (CEP) rather than the instantaneous pole of rotation (IPR) of the previous theory (Woolard, 1953) are analyzed and discussed. The CEP implicitly accounts for the forced diurnal polar motion and thus implies a fixed change of 0.0087 arcsec in the mean celestial pole. It is pointed out that past determinations of the obliquity and the celestial pole which were assumed to be referred to the IPR were actually referred to the CEP. A number of clarified formulations of the new theory are proposed.
Capitaine Nicole
Seidelmann Kenneth P.
Williams James G.
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