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