IAU 2012 Resolution Proposal - Re-definition of the astronomical unit of length.
Written proposal and cover letter located here.

4 slides regarding proposal located here.

Written proposal located here.

Statement regarding deliberation in Beijing, August 2012.

added 2 July 2012


Earth rotation, reference systems and celestial mechanics: Synergies of geodesy and astronomy. September 19-21, 2011 - Vienna.
Click here

added 8 feb 2011


2012 General Assembly

The 2012 General Assembly will take place in Beijing from 20-31 August 2012. The scientific programme of the General Assembly will be decided by the IAU Executive Committee at its meeting in Prague, May 24-26 2011.

IB 106 is online

The Information Bulletin 106 (24 August 2010) is online. Download the PDF file here.

Proceedings IAU Symposium No. 261 online

Proceedings IAU Symposium No. 261
Relativity in Fundamental Astronomy: Dynamics, Reference Frames, and Data Analysis
Eds. Sergei Klioner, P. Kenneth Seidelmann and Michael Soffel
Cambridge University Press, ISBN 9780-521-76481-0
Read more

New IAU Transactions On-line

IAU Transactions XXVIIB, Proceedings of the 27th IAU General Assembly, Rio de Janeiro 2009, Ed. Ian F. Corbett, Cambridge University Press, ISBN 9780-521-76831-3, is now on line. See http://www.iau.org/science/news/101/

New SOFA software release includes geodetic/geocentric transformations

SOFA (Standards of Fundamental Astronomy) is an IAU Service that operates under Division I (Fundamental Astronomy). It has developed a set of software routines that implement official IAU algorithms for fundamental-astronomy computations. A new release of the software was made on 2009 December 31. The total number of routines is 165, comprising 113 astronomy routines supported by 52 vector/matrix routines. The release incorporates the new IAU precession model that came into force at the start of 2009. There is a "cookbook" that introduces the SOFA routines associated with precession-nutation and Earth rotation. The most significant change since the previous release is the introduction of five new routines (available in both Fortran and C) to support transformations between geodetic and geocentric coordinates. The Web address of the SOFA home page has changed, and is now: http://www.iausofa.org/.
Further information on the new release is available here.

IB 105 is online

The Information Bulletin 105 (13 January 2010) is online. Download the PDF file (8 MB) here.

Proceedings IAU Symposium No. 261 online

Proceedings IAU Symposium No. 261
Relativity in Fundamental Astronomy: Dynamics, Reference Frames, and Data Analysis
Eds. Sergei Klioner, P. Kenneth Seidelmann and Michael Soffel
Cambridge University Press, ISBN 9780-521-76481-0
Read more

Resolutions adopted at the IAU GA 2009

Resolutions adopted at the IAU General Assembly 2009 in Rio de Janeiro are available in PDF format (237 KB). Download the file here.

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