Proposed terminology in fundamental astronomy based on IAU 2000 Resolutions

Details Proposed terminology in fundamental astronomy based on IAU 2000 Resolutions Proposed terminology in fundamental astronomy based on IAU 2000 Resolutions

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..16e..18c&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

We present the proposals of the Division 1 Working Group on "Nomenclature for Fundamental Astronomy" (NFA) that was formed at the 25^th IAU GA in 2003. The NFA Recommendations consist for example of specifying the terminology associated with the new paradigm, defining the celestial and terrestrial "intermediate systems", keeping the classical terminology for "true equator and equinox" and giving the name "equation of the origins" to the distance between the Celestial intermediate origin (CIO) and the equinox along the intermediate equator. The NFA WG has also proposed a re-definition of Barycentric Dynamical Time (TDB) through a linear transformation of Barycentric Coordinate Time (TCB). These recommendations have resulted from a detailed discussion within the WG on issues described in a number of Newsletters and documents issued by the WG and posted on the NFA web site at http://syrte.obspm.fr/iauWGnfa/ .A special page of the NFA web site makes available documents with educational purposes relevant to the NFA issue. The NFA explanatory document supplies information on the terminology and guidelines recommended by the WG. The NFA Glossary provides a set of detailed definitions that best explain all the terms required for implementing the IAU 2000 resolutions. The other sections provide complementary and supporting material to facilitate the understanding and implementation of the IAU resolutions, as well as illustrating the Glossary. The NFA WG has submitted two resolution proposals to the IAU 2006 General Assembly; one is a "Supplement to the IAU 2000 Resolutions on reference systems" for harmonizing the name of the pole and origin to `intermediate' and fixing the default orientation of the BCRS and GCRS; the other one is a re-definition of TDB.

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