Cookies help us to provide our services. By using our website you agree that we can use cookies. Read more about our Privacy Policy and visit the following link: Privacy Policy

International Earth Rotation and Reference Systems Service

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

International Union of Geodesy and Geophysics (IUGG)

Year	Download
2023	IUGG2023 Resolutions (PDF, 62KB, Not barrier-free file.)
2019	IUGG2019 Resolutions (PDF, 68KB, Not barrier-free file.)
2015	IUGG2015 Resolutions (PDF, 79KB, Not barrier-free file.)
2011	IUGG2011 Resolutions (PDF, 19KB, Not barrier-free file.)
2007	IUGG2007 Resolutions (PDF, 22KB, Not barrier-free file.)
2003	IUGG2003 Resolutions (PDF, 119KB, Not barrier-free file.)
1999	IUGG1999 Resolutions (PDF, 84KB, Not barrier-free file.)
1995	IUGG1995 Resolutions (PDF, 85KB, Not barrier-free file.)
1991	IUGG1991 Resolutions (PDF, 105KB, Not barrier-free file.)

International Association of Geodesy (IAG)

Year	Download
2019	IAG2019 Resolutions (PDF, 92KB, Not barrier-free file.)
2011	IAG2011 Resolutions (PDF, 62KB, Not barrier-free file.)
2007	IAG2007 Resolutions (PDF, 59KB, Not barrier-free file.)
1991	IAG1991 Resolutions (PDF, 71KB, Not barrier-free file.)

International Astronomical Union (IAU)

Year	Download
2021	IAU2021 Resolution B1 (PDF, 156KB, Not barrier-free file.) IAU2021 Resolution B2 (PDF, 124KB, Not barrier-free file.) IAU2021 Resolution B3 (PDF, 126KB, Not barrier-free file.)
2018	IAU2018 Resolution B1 (PDF, 98KB, Not barrier-free file.) IAU2018 Resolution B2 (PDF, 71KB, Not barrier-free file.)
2009	IAU2009 Resolutions (PDF, 237KB, Not barrier-free file.)
2006	IAU2006 Resolution B1 (PDF, 51KB, Not barrier-free file.) IAU2006 Resolution B2 (PDF, 29KB, Not barrier-free file.) IAU2006 Resolution B3 (PDF, 30KB, Not barrier-free file.)
2000	IAU2000 Resolutions B1-B3 (PDF, 274KB, Not barrier-free file.)
1997	IAU1997 Resolutions (PDF, 632KB, Not barrier-free file.)
1991	IAU1991 Recommendations (PDF, 1MB, Not barrier-free file.)