Institute of Geodesy and Cartography
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Reference systems
International Terrestrial Reference System (ITRS)
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International Celestial Reference System (ICRS)
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Time systems
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Reference Systems - IAU & IUGG Resolutions
IAU and IUGG Recomendations
The transformation between the celestial and terrestrial reference system
The history of the concepts and procedures of terrestrial to celestial reference systems transformation
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