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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

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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