Welcome to the web page for the International Astronomical Union (IAU) Working Group (WG) on Numerical Standards for Fundamental Astronomy (NSFA). This WG was set up by a proposal adopted at the IAU General Assembly in 2006. The stated goals of the proposed WG:
The NSFA WG pages are being maintained by IAU Commission A3: Fundamental Standards .
The report of this WG that lists the IAU 2009 System of Astronomical Constants together with all the detailed notes and explanations has been published in Celestial Mechanics and Dynamical Astronomy under Open Access. Open Access permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
The pages with the IAU 2009 constants have finally been aligned and corrected to agree with the Report to be published in Celestial Mechanics and Dynamical Astronomy. Until the Current Best Estimates require updating they are in agreement with the IAU 2009 Constants.
The new NFSA web pages have now been adopted as the official pages.
The Working Group meet after the Journees at the Paris Observatory. At the meeting procedures for the adoption new best estimates was discussed. A proposal concerning the definition of the astronomical unit was considered.