Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009iau...261.0303c&link_type=abstract
American Astronomical Society, IAU Symposium #261. Relativity in Fundamental Astronomy: Dynamics, Reference Frames, and Data Ana
Astronomy and Astrophysics
Astronomy
Scientific paper
The celestial Earth's orientation is currently determined with sub-milliarcsecond accuracy by VLBI observations and is required for many applications in fundamental astronomy and geodesy. Models for that orientation rely on solutions for the Earth's rotational motion in the Geocentric celestial reference system (GCRS), which take into account the equations for a rigid Earth model and the geophysical representation of the non-rigid Earth effects.
Important resolutions on reference systems and Earth rotation have been adopted by IAU and IUGG since 2000. They include changes in the way the celestial orientation of the Earth is expressed as well as a new nomenclature associated with the new concepts. They also adopted high accuracy models for expressing the relevant quantities for the transformation from terrestrial to celestial systems. This includes a rigorous definition of sidereal rotation of the Earth and refined precession and nutation models that are suitable for modern and future realizations of the reference systems.
This presentation will review the consequences of the joint IAU 2000/2006 resolutions on the parameters to be used for Earth rotation, on the precession-nutation models and the associated nomenclature. It will summarize the fundamental aspects of the IAU 2000/2006 semi-analytical precession-nutation models as compared with other models and with astronomical observations. This presentation will also compare different forms of expressing the dynamical equations of the rotation of a rigid Earth and will especially consider that expressed as function of the new parameters for representing precession and nutation. It will finally discuss different forms of the equations for a practical integration necessary for providing semi-analytical solutions.
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