International Earth rotation and Reference systems Service (IERS)
Paris Observatory IERS Centers
... observing quasars for monitoring our changing Earth
ICRS Center
Earth Orientation Center
Service de la Rotation de la Terre
SYRTE, Observatoire de Paris
PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, LNE
61 av. de l'Observatoire, 75014 Paris, France
