You are here: Home / USNO / Earth Orientation / EO Information Center / General Information / IERS Conventions 2003 (Technical Note 32)
The USNO websites,,,,,, and are undergoing modernization efforts. The expected completion of the work and the estimated return of service is Fall 2020, subject to change due to potential impacts of COVID-19.

IERS Conventions 2003 (Technical Note 32)

The IERS Conventions 2003 was finalized in October 2003, and the printed version is available as IERS Technical Note 32. Note that when referenced in recommendations and articles published in past years, this document may have been referred to as the IERS Conventions (2000).

The content of this web page is now frozen to the present version of the IERS Conventions.

USNO Master Clock Time
Javascript must be Enabled