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SOFA (astronomy) : ウィキペディア英語版 | SOFA (astronomy)
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. ==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 * Astrometric transformations * Galactic Coordinates
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