IAU and IUGG recommendations
on reference systems and on the IERS
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)
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