Scientific discussions

On the choice of new parameters for Earth's orientation (CIP, CIO, etc.)

Reconsideration of the definition of the CEP

Discussion on the choice of new parameters for Earth's orientation

Discussion on the modern definition of the pole and Earth orientation parameters

IAU Working Group T5 (June 1998-March 2000)

On new concepts and models for reference systems (GCRS CIP coordinates, precession, nutation, etc.)

IAU Division 1 meeting (at IAU General Assembly, Sydney, July 2003)

On Earth's rotation (International services, Nutation, FCN, UT1, etc.)

IAU Commission 19 meeting (at IAU General Assembly, Sydney, July 2003)

On nomenclature for fundamental astronomy

IAU Working Group NFA (November 2003-October 2007)

On the new definition of the astronomical unit

Summary of the discussion (2011-2012)