Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sf2a.conf....7c&link_type=abstract
SF2A-2004: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 14-18, 2004. Edited by F. Combes, D. Barret
Astronomy and Astrophysics
Astronomy
Scientific paper
The application of the very long baseline interferometry (VLBI) technique to astrometry, by giving access to a ``quasi-ideal'' celestial system, has challenged the traditional definitions of fundamental astronomy. The use of VLBI together with space geodetic techniques (GPS, laser ranging) for a high precision determination of the Earth's rotation and reference systems requires a worldwide coordination relying on common conventions and models. Moreover the significant improvement in the precision of measurements has required astronomers, geodesists and geophysicists to combine their efforts to improve the models for effects for which a few years ago approximate theories were still sufficient. .Such an evolution of fundamental astronomy due to the technique has been accompanied by an evolution of ideas and models. Thus, the international astronomical Union, after having adopted, in 1997, the International Reference System (ICRS) realized by a set of coordinates of extragalactic radio sources, has adopted in 2000 a new set of resolutions in order to use this celestial reference system in the most accurate way. These resolutions, also adopted by the IUGG in 2003, are recommending new concepts (abandonment of the equinox as a reference, revision of the definition of the celestial pole, Universal Time, Sidereal Time, etc.) and new models (relativistic transformation of the space and time coordinates between the barycentric and geocentric reference systems, precession and nutation of a non-rigid Earth model, etc.) to be considered for a scientific use of high accuracy observations. This talk will present the most recent developments of concepts and models in the field of celestial reference systems and Earth's rotation.
No associations
LandOfFree
Recent developments in the concepts and models for fundamental astronomy does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Recent developments in the concepts and models for fundamental astronomy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Recent developments in the concepts and models for fundamental astronomy will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1165807