A major release of the SOFA (Standards of Fundamental Astronomy) software was issued on 2 December 2013. This includes the new section "Astrometry" consisting of 32 routines and a cookbook.  See the SOFA website at www.iausofa.org for downloads and details of all changes.

SOFA operates under the auspices of the International Astronomical Union (IAU) to provide an accessible and authoritative set of algorithms and procedures that implement standard models used in fundamental astronomy. The service is managed by an international panel, the SOFA Board, appointed through IAU Division A — Fundamental Astronomy. SOFA also works closely with the International Earth Rotation and Reference Systems Service (IERS).