The IERS Conventions define the standard reference systems to be used by the IERS. They contain conventional models, constants and standards.
IERS Technical Note No. 3 (IERS Standards 1989)
After the completion of Conventions (2010), work started to prepare future updates. The updated version of the IERS Conventions is available as a working version at IERS Conventions Center. It is not definitive nor officially approved.
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