Glossary (Updated)

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All content in the updated pages should be considered under development and are not definitive nor officially approved as a registered edition. For the official IERS Conventions (2010), please download the packaged v 1.0.0.


  • 28 December 2018:
    • Modify definition of "mean pole" and "polar motion".
    • Introduce definition for "secular pole".
  • 22 December 2011:
    • In the term "celestial pole offsets," replace "IAU 2000" with "IAU 2006/2000".