– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
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International Earth Rotation and Reference Systems Service (IERS)

The International Earth Rotation and Reference Systems Service (IERS) was established by the International Astronomical Union and the International Union of Geodesy and Geophysics.

The IERS provides data on Earth orientation, on the International Celestial Reference System/Frame, on the International Terrestrial Reference System/Frame, and monitors the difference between UT1 and UTC.

Links between the BIPM and the IERS:

  • The IERS decides on the dates of application of leap seconds on UTC.

BIPM contact(s):

Organization: