Essential Routines for Fundamental Astronomy

 ERFA is a C library containing key algorithms for astronomy, and is
 based on the SOFA library published by the International Astronomical
 Union (IAU).
 .
 It is intended to replicate the functionality of SOFA (aside from
 possible bugfixes in ERFA that have not yet been included in SOFA),
 but is licensed under a three-clause BSD license to enable its
 compatibility with a wide range of open source licenses. Permission
 for this release has been obtained from the SOFA board.
 .
 This package contains the shared library.