The IERS provides data on Earth orientation, on the International Celestial Reference System/Frame, on the International Terrestrial Reference System/Frame, and on geophysical fluids. It maintains also Conventions containing models, constants and standards.
re3data.org: International Earth Rotation and Reference Systems Service;
editing status 2016-10-07;
re3data.org - Registry of Research Data Repositories. http://doi.org/10.17616/R34G7H
last accessed: 2017-01-19