Standards of Fundamental Astronomy
The International Astronomical Union's SOFA service has the task of establishing and maintaining 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).
IAU SOFA Center
This website provides access to the SOFA Software Collection which is currently available for both Fortran 77 and ANSI C. Information on how to obtain it and instructions for its use are available by following the link to current software below.
Using SOFA software is free of charge under the terms and conditions of the SOFA licence.
Download the latest release
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Fortran 77
The latest release from 2023-10-11 is available.
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ANSI C
The latest release from 2023-10-11 is available.
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Summary of changes
A summary of changes for the latest release is available.