[ 源代码： erfa ]
软件包：liberfa1（2.0.1-1 以及其他的）
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.