Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....58....1l&link_type=abstract
Astronomy and Astrophysics, vol. 58, no. 1-2, June 1977, p. 1-16.
Astronomy and Astrophysics
Astrophysics
169
Celestial Mechanics, Precession, Reference Systems, Celestial Bodies, Ecliptic, Solar System, Tables (Data)
Scientific paper
The structure of the expressions usually employed in calculating the effects of precession is examined, and a method is outlined for revising the expressions to account for changes in the fundamental astronomical constants. It is shown that the basic set of parameters, upon which depend the lengthy polynomials for computing the mean obliquity of data and the elements of the precession matrix, consists of the mean obliquity, the speed of general precession in longitude at a fixed epoch, and the system of planetary masses. Special attention is given to the motion of the ecliptic pole, formulations for a basic epoch as well as an arbitrary epoch, and ecliptic motion relative to the basic epoch. Numerical precession quantities at epoch J2000.0 (JED 2451545.0) are presented which result from the revision of astronomical constants adopted at the XVI General Assembly of the IAU.
Fricke Walter
Lederle Tr.
Lieske Jay H.
Morando Bruno
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