IERSin

IERSin is a data dissemination platform developed by the International Earth Rotation and Reference Systems Service (IERS) to provide centralized access to IERS products and services. It is intended to support researchers, space agencies, and navigation services by consolidating timekeeping, geodetic, and astrometric data into a single, user-friendly interface.

Content organized within IERSin includes Earth Orientation Parameters (EOP) such as UT1-UTC and polar motion, as well as IERS bulletins (rapid and final) that accompany these values. It also hosts reference-frame realizations for the International Celestial Reference System (ICRS) and the International Terrestrial Reference System (ITRS), together with associated frames (ICRF and ITRF), station coordinates, and velocity models. Transformations between time scales, frames, and Earth orientation products are provided to support data interoperability.

Access to IERSin is via a web portal offering search, browse, and download capabilities. A programmatic API supports automated retrieval and integration into external workflows. Data are available in multiple formats, including CSV, JSON, NetCDF, and traditional IERS text bulletins, with accompanying documentation and versioning to preserve reproducibility.

Governance and reception: IERSin is maintained by IERS in coordination with international partners such as the IAU, IAG, and IGS. It is used by a wide range of users, including GNSS processing centers, satellite mission teams, astronomical observatories, and national metrology services. The platform emphasizes long-term stability, data provenance, and open access to essential geodetic and timekeeping information.