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Document: sofa-c
Title: Standards Of Fundamental Astronomy
Section: Programming
Author: International Astronomical Union
Abstract: SOFA stands for Standards Of Fundamental Astronomy. The SOFA
 software is a collection of Fortran 77 and C subroutines that implement
 official IAU algorithms for fundamental-astronomy computations. At the
 present time the SOFA subprograms comprise 131 “astronomy” routines supported
 by 55 “vector/matrix” routines. 
 .
 The basic documentation for the SOFA collection is terse, consisting of (i)
 detailed preamble comments in the individual routines and (ii) classified and
 alphabetic lists of subroutine calls. For an important subset of the SOFA
 routines, namely those concerned with the Earth’s orientation and rotation,
 the present paper supplements the basic documentation with descriptive
 material and cookbook examples.

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