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IAU and IUGG recommendations
on reference systems and on the IERS


IAU 2006 Resolutions 1-3


IAU(2000) Resolutions B1 to B3


IAU(1997) Resolutions B1 to B6

B1. On the use of Julian Dates and Modified Julian Dates

B2. Adopting the International Celestial Reference System (ICRS) and
charging the ICRS IAU Working Group (see resolution B4)

B3. On non-rigid Earth Nutation theory

B4. Creating the ICRS Working Group to study and make recommendations on
the consequences of the adoption of the ICRS

B5. On Relativity in Celestial Mechanics and in Astrometry

B6. Encouraging VLBI and LLR observations


IAU(1991) Recommendations I to IX

I. Definition of systems of space-time coordinates within the framework of the General Theory of Relativity

II. Physical structures and quantities that will be used to establish the reference frames and time scales based upon the ideal definition of the system given by Recommendation I

III. Standardisation of the units and origins of coordinate times used in astronomy: Geocentric Coordinate Time (TCG) and Barycentric Coordinate Time (TCB)

IV. The Terrestrial Time (TT)

V. Use of Barycentric Dynamical Time (TDB)

VI. Selection of extragalactic objects on which the conventional celestial barycentric reference system will be based

VII. Definition and realization of the conventional celestial barycentric reference system

VIII. Astronomical quantities, conventions, models, software, etc.

IX. Nutation angles: IAU conventional models and IERS observational results


IUGG(1991) Resolution 2

The Conventional Terrestrial Reference System


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