Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..16e..10v&link_type=abstract
Nomenclature, Precession and New Models in Fundamental Astronomy, 26th meeting of the IAU, Joint Discussion 16, 22-23 August 200
Astronomy and Astrophysics
Astronomy
Scientific paper
Both old (IAU1976) and newly proposed (P03) parametrizations of precession are based on polynomial developments of the associated angles. Such developments are designed to achieve very high precision for several centuries around the central epoch, J2000. However, when extrapolated to more distant epochs, they start to diverge from a more realistic long-term predictions coming from a numerical integration of the motion of the rotating Earth and the bodies of the solar system. The aim of this presentation is to propose another parametrization of precession, based on long-periodic functions of time rather than polynomials, which would yield results with precision approaching that of P03 for epochs close to J2000, and a good fit to numerical integration for longer time intervals, up to several hundreds centuries.
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