Astronomisches Rechen-Institut Heidelberg

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ARI-Heidelberg Mitteilungen Serie B, No. 31

Author(s): Laubscher, R.E.
Title: A Determination of the Motion of the Ecliptic
Source: Astron. Astrophys. 20, 407-414
Year: 1972
Abstract: As an aid to the critical examination of the IAU system of astronomical constants currently underway (Proceedings of IAU Colloquium No. 9, 1970), this paper provides a discussion of the theoretical motion of the ecliptic based on improved values for the reciprocal planetary masses. Power series in time for the position of the pole of the ecliptic are derived which then yield the corrections +0.036'' +/- 0.006'' per century and -0.029'' +/- 0.010'' per century at 1850.0 to Newcomb's values of the secular variation of the obliquity and the first-order term in the planetary precession, respectively. The derivation of the cited error estimates is discussed in detail.
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