International Earth rotation and Reference systems Service (IERS)
Paris Observatory IERS Centers
... from quasars to our changing Earth
IERS ICRS Center
IERS Earth Orientation Center
IERS Conventions Center
SYRTE, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, LNE
61 av. de l'Observatoire, 75014 Paris, France