On the Procession Expressions Based on the de Ephemeris

Details On the Procession Expressions Based on the de Ephemeris On the Procession Expressions Based on the de Ephemeris

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ap%26ss.177..447z&link_type=abstract

Astrophysics and Space Science, Volume 177, Issue 1-2, pp. 447-450

Astronomy and Astrophysics

Astrophysics

Scientific paper

Since 1984, the new IAU (1976) System of Astronomical Constants has become effective; meanwhile, the new lunar and planetary ephemerides (DE200/LE200) have been introduced into the Astronomical Almanac. In order to obtain the best fit of these ephemerides to the observational data, some modifications to the constants were made (Kaplan 1961). The modified values of these constants have been accepted by many users (particularly in the Merit Project), (Melbourne et al. 1983), although there has not been any new resolution of IAU. To avoid these inconsistencies, it seems to be necessary to rediscuss the adopted value of some astronomical constants in the new system. This paper discusses the problems for selection of the precession quantities and derives the precession expressions based on the motion of ecliptic from the DE ephemeris.

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