KnowraInternational Celestial Reference SystemLinked fromLinked fromThe 7 pages that link to International Celestial Reference System, each with the reason it gives.All 7Broader topic 1Related 6International Astronomical UnionRelated: The Union endorses standards that let observatories report positions consistently.VizieRRelated: Coordinate-based catalogue searches depend on consistently specified sky positions.Sidereal timeRelated: Modern astronomy relates Earth’s orientation and sidereal measures to this reference framework.Earth orientation parametersRelated: Celestial pole coordinates express Earth’s orientation relative to this nearly inertial system.Astronomical coordinate systemsRelated: Precision astrometry needs a stable celestial frame that does not rotate with Earth.Astronomical nutationRelated: Modern Earth-orientation measurements express nutation against this reference.