корисні посилання

	Головна астрономічна обсерваторія Національної академії наук України (ГАО НАНУ)
	Massachusetts Institute of Technology (MIT)
	Mediterranean GPS Network, University NAVSTAR Consortium (UNAVCO)
	European Reference Frame (EUREF)
	EUREF Permanent Network Central Beuro (EPN CB)
	Federal Agency of Cartography and Geodesy (BKG)
	International GNSS Service (IGS)
	NASA's Goddard Space Flight Center (NASA/GSFC)
	International VLBI Service for Geodesy and Astrometry (IVS)
	National Astronomical Observatory of Japan (NAOJ)
	European VLBI Network (EVN)
	Joint Institute for Very Long Baseline Interferometry in Europe (JIVE)
	International Laser Ranging Service (ILRS)
	Crustal Dynamics Data Information System (CDDIS)
	Laboratory for Research in Geodesy (LAREG)
	University of Texas, Center for Space Research
	Eurolas Data Center (EDC) at DGFI/ILRS Global Data Center
	International Earth Rotation and Reference Systems Service (IERS)
	Bureau International des Poids et Mesures (BIPM)
	United States Naval Observatory (USNO)