The Standards of Fundamental Astronomy (SOFA) software libraries are a collection of subroutines that implement official International Astronomical Union (IAU) algorithms for astronomical computations.
As of February 2009 they are available in both Fortran and C source code format.
The subroutines in the libraries cover the following areas: As of the February 2009 release, SOFA licensing changed to allow use for any purpose, provided certain requirements are met.
[1] Previously, commercial usage was specifically excluded and required written agreement of the SOFA board.
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