Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jsrs.meet..168h&link_type=abstract
In: Journées 2004 - systèmes de référence spatio-temporels. Fundamental astronomy: new concepts and models for high accuracy obs
Astronomy and Astrophysics
Astronomy
Astronomical Almanac
Scientific paper
Following the resolutions of the 24th International Astronomical Union in 2000 (IAU 2000) together with the implementation and availability of the various software routines, it became imperative that The Astronomical Almanac (AsA) included the IAU recommended techniques for applying precession-nutation. This involves introducing the Earth rotation angle (ERA), the adopted relationship between Universal Time (UT1) and the rotation of the Earth, together with the celestial intermediate origin (CIO), the corresponding origin for right ascension. The introduction of the CIO has been complicated by the fact that new nomenclature is required, which is in the process of being discussed and agreed by the IAU Working Group on Nomenclature for Fundamental Astronomy. However, an attempt has been made in the 2006 edition to incorporate the new nomenclature (which is also used here) and describe the process in a straight forward way with the intention of helping the diverse user community.
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