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IAU and IUGG/IAG recommendations on reference systems and on the IERS

IAG (2019) Resolutions

1: The International Terrestrial Reference Frame (ITRF)

2: Third Realization of the International Celestial Reference Frame

5: Improvement of the Earth’s Rotation Theories and Models

IUGG (2019) Resolution 2

The International Terrestrial Reference Frame (ITRF)

IAU (2018) Resolutions

B1: Geocentric and International Terrestrial Reference Systems and Frames

B2: The Third Realization of the International Celestial Reference Frame

IUGG (2015) Resolution 3

Global Geodetic Reference Frame

IAG (2011) Resolution 2

Second Realization of the International Celestial Reference Frame

IUGG (2011) Resolution 3

Second Realization of the International Celestial Reference Frame

IAU (2009) Resolution B3

Second Realization of the International Celestial Reference Frame

IUGG (2007) Resolutions

1: Precession, nomenclature, and definition of TDB (Temps Dynamique Barycentrique)

2: Geocentric and International Terrestrial Reference Systems (GTRS and ITRS)

IAU (2006) Resolutions 1-3

1: Precession Theory and Definition of the Ecliptic

2: Supplement to the IAU 2000 Resolutions on reference systems

3: Re-definition of Barycentric Dynamical Time, TDB

IUGG (2003) Resolution 4

Adoption of the Resolutions B1.1 through B1.9 ofIAU 24th General Assembly, 2000

IAU (2000) Resolutions B1 to B2

B1.1 Maintenance and Establishment of Reference Frames and Systems

B1.2 Hipparcos Celestial Reference Frame

B1.3 Definition of Barycentric Celestial Reference System and Geocentric Celestial Reference System

B1.4 Post-Newtonian Potential Coefficients

B1.5 Extended relativistic framework for time transformations and realisation of coordinate times in the solar system

B1.6 IAU 2000 Precession-Nutation Model

B1.7 Definition of Celestial Intermediate Pole

B1.8 Definition and use of Celestial and Terrestrial Ephemeris Origins

B1.9 Re-definition of Terrestrial Time TT

B2 Coordinated Universal Time


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

IUGG (1995) Resolution No. 1

International Earth Rotation Service (IERS)


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) Resolutions

No. 2: Conventional Terrestrial Reference System (CTRS)

No. 3: Rapid variations in Earth rotation

No. 5: VLBI and SLR observing campaigns in conjunction with the IGS work


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