Astrophysics and Space Science

, Volume 177, Issue 1–2, pp 447–450 | Cite as

On the precession expressions based on the de ephemeris

  • Hui Zhang
  • Tianyi Huang
  • Bangxin Xu


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.


Observational Data Planetary Ephemerid Astronomical Constant Merit Project Astronomical Almanac 
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Copyright information

© Kluwer Academic Publishers 1991

Authors and Affiliations

  • Hui Zhang
    • 1
  • Tianyi Huang
    • 2
  • Bangxin Xu
    • 2
  1. 1.Shaanxi ObservatoryAcademia SinicaXian
  2. 2.Department of AstronomyNanjing UniversityNangingPeople's Republic of China

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