SOFA software libraries

Stable release	2009-02-01 / 02 April 2009
Written in	C and Fortran
Operating system	cross platform
Type	Numerical library
License	SOFA Software License
Website	http://www.iau-sofa.rl.ac.uk/

The SOFA (Standards of Fundamental Astronomy) software libraries are a collection of subroutines that implement official IAU algorithms for astronomical computations.

As of February 2009 they are available in both Fortran and C source code format.

Contents 1 Capabilities 2 Licensing 3 References 4 External links

[edit] Capabilities

The subroutines in the libraries cover the following areas:

• Calendars
• Time scales
• Earth's rotation and sidereal time
• Ephemerides (limited precision)
• Precession, nutation, polar motion
• Proper motion
• Star catalog conversions

[edit] Licensing

As of the February 2009 release, the SOFA licensing changes 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.^[2]

[edit] References

[edit] External links

• SOFA Home Page
• International Astronomical Union

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