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International Earth Rotation and Reference Systems Service

Glossary


The following terms are related to the IERS and to Earth rotation and reference systems in general. 
Additions will follow, proposals are welcome.

J2000.0

defined in the framework of General Relativity by IAU 1994 Resolution C7 as being the event (epoch) at the geocenter and at the date 2000 January 1.5 TT = Julian Date 245 1545.0 TT. Note that this event has different dates in different time scales.


Source: IERS Technical Note 36: Glossary (PDF, 244KB, Not barrier-free file.) of the IERS Conventions (2010)

Original Source: IAU 2006 NFA Glossary