Iausofa.org
Standards of Fundamental Astronomy - Home
Provides authoritative ANSI C and Fortran libraries with standard algorithms for astronomy calculations, including time, motion, and celestial models.
Access standard astronomy algorithms and libraries
The Standards of Fundamental Astronomy (SOFA) website is a resource for astronomers and developers needing reliable algorithms and routines for precise astronomical calculations. Here, you can find authoritative libraries in ANSI C and Fortran 77 that implement standard models used in fundamental astronomy, such as precession, nutation, time scales, and more.
Whether you're working on research, building astronomy software, or need to convert between star catalogs, SOFA provides trusted, canonical routines that ensure consistency and accuracy. The site is backed by the International Astronomical Union, making it a go-to source for those looking to reference or implement the latest standard procedures in the field.
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