EntityQ74561· pop 12· linked from 84 articlesInternational Terrestrial Reference SystemSign in to saveworld spatial reference system co-rotating with the Earth in its diurnal motion in spaceConnectionsgeodetic reference systemEntityInternational Earth Rotation and Reference Systems ServiceEntityWorld Geodetic SystemEntityECEFEntityInternational System of UnitsEntityGlobal Positioning SystemEntityEuropean Space AgencyEntitydigital object identifierEntitybibcodeEntityframe of referenceEntityGalileoEntityGLONASSEntityBeiDouEntitymeasurement errorEntitymeasurement standardEntityHandle SystemEntityInternational Celestial Reference SystemEntityPZ-90EntityNorth American DatumEntityCategoriesGeodetic datums