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Title: New model of precession, valid in time interval 400 thousand years (English)
Author: Vondrák, Jan
Language: English
Journal: Applications of Mathematics 2012
Volume: Proceedings. Prague, May 2-5, 2012
Issue: 2012
Pages: 290-299
Category: math
Summary: Precession is the secular and long-periodic component of the motion of the Earth's spin axis in the celestial reference frame, approximately exhibiting a motion of about $50''$ per year around the pole of the ecliptic. The presently adopted precession model, IAU2006, approximates this motion by polynomial expansions of time that are valid, with very high accuracy, in the immediate vicinity (a few centuries) of the reference epoch J2000.0. For more distant epochs, this approximation however quickly deviates from reality. As a reaction to this problem, a new model, comprising very long-period terms fitted to a numerical integration of the motion of solar system bodies on scales of several thousand centuries, was recently published by the present author with co-authors from France and United Kingdom in Astronomy & Astrophysics. Here a shorter description of the new model, including a new assessment of its accuracy and comparisons with other models, is given. (English)
Keyword: axial precession
MSC: 65L70
MSC: 65M20
MSC: 70F15
MSC: 85A05
idZBL: Zbl 1313.70009
idMR: MR3204420
Date available: 2017-02-14T09:04:55Z
Last updated: 2017-04-13
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