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・ International Carnivorous Plant Society
・ International Carrom Federation
・ International Cartographic Association
・ International Cartoonists Exhibition
・ International Castle Research Society
・ International Catalogue of Scientific Literature
・ International Catalogue of Scientific Papers
・ International Cataloguing Standards Committee
・ International Catamaran Challenge Trophy
・ International Catholic Conference of Scouting
・ International Catholic Migration Commission
・ International Catholic-Jewish Historical Commission
・ International Catholic-Jewish Liaison Committee
・ International Cavaliers
・ International Celestial Reference Frame
International Celestial Reference System
・ International Census of Marine Microbes
・ International Center
・ International Center for Academic Integrity
・ International Center for Advanced Internet Research
・ International Center for Agricultural Research in the Dry Areas
・ International Center for AIDS Care and Treatment Programs – ICAP
・ International Center for Creativity
・ International Center for Development Policy
・ International Center for East Asian Archaeology and Cultural History
・ International Center for Elementary Particle Physics
・ International Center for Human Development
・ International Center For Islam and Pluralism
・ International Center for Journalists
・ International Center for Law and Religion Studies


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International Celestial Reference System : ウィキペディア英語版
International Celestial Reference System
The International Celestial Reference System (ICRS) is the current standard celestial reference system adopted by the International Astronomical Union (IAU). Its origin is at the barycenter of the Solar System, with axes that are intended to be "fixed" with respect to space. ICRS coordinates are approximately the same as equatorial coordinates: the mean pole at J2000.0 in the ICRS lies at 17.3±0.2 mas in the direction 12 h and 5.1±0.2 mas in the direction 18 h. The mean equinox of J2000.0 is shifted from the ICRS right ascension origin by 78±10 mas (direct rotation around the polar axis).
==See also==

* International Celestial Reference Frame
* Barycentric celestial reference system
* International Terrestrial Reference System
* Astronomy
* Astrometry

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