erfa

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  "desc": "Essential Routines for Fundamental Astronomy",
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  "full_name": "erfa",
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  "github_last_commit_at": "2026-04-14T10:56:39Z",
  "github_readme_excerpt": "This is the source code repository for ERFA (Essential Routines for\nFundamental Astronomy).  ERFA is a C library containing key algorithms for\nastronomy, and is based on the `SOFA library \u003chttp://www.iausofa.org/\u003e`_ published by the International\nAstronomical Union (IAU).\n\nERFA is intended to replicate the functionality of SOFA (aside from possible\nbugfixes in ERFA that have not yet been included in SOFA), but is licensed\nunder a three-clause BSD license to enable its compatibility with a wide\nrange of open source licenses. Permission for this release has been\nobtained from the SOFA board, and is available in the ``LICENSE`` file included\nin this source distribution.\n\nDifferences from SOFA\n---------------------\n\nThis version of ERFA (v2.0.0) is based on SOFA version \"20210512\", with the\ndifferences outlined below.\n\nERFA branding\n^^^^^^^^^^^^^\n\nAll references to \"SOFA\" in the source code have been changed to ERFA, and\nfunctions have the prefix ``era`` instead of ``iau``.\n\nC macro prefixes\n^^^^^^^^^^^^^^^^\n\nAll C macros used in ERFA are the same as their SOFA equivalents, but with an\n``ERFA_`` prefix to prevent namespace collisions.\n\nVersion information\n^^^^^^^^^^^^^^^^^^^\n\nERFA provides a few utility functions for accessing version information at\nruntime which are not a part of SOFA.  Specifically, these are the\n``eraVersion``, ``eraVersion*``, and ``eraSofaVersion`` functions that are\nexposed in the ``erfaextra.h`` header.\n\nRuntime leap second modification\n^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n\nERFA provides the capability to modify at runtime the leap seconds assumed for\nvarious calculations. These are accessed via the ``eraGetLeapSeconds`` and\n``eraSetLeapSeconds`` functions that are exposed in the ``erfaextra.h`` header.\nThis functionality is currently considered somewhat experimental, meaning an\nimproved API might be available in the future, but the current API can also be\ncounted on for the near future.\n\nBug fixes\n^^^^^^^^^\n\nERFA includes smaller changes that may or",
  "github_repo": "liberfa/erfa",
  "github_stars": 171,
  "github_topics": [],
  "homepage": "https://github.com/liberfa/erfa",
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  "last_seen": "2026-06-20T23:34:18+00:00",
  "license": "BSD-3-Clause",
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  "name": "erfa",
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  "ruby_source_path": "Formula/e/erfa.rb",
  "tap": "homebrew/core",
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  "version_head": "HEAD",
  "version_stable": "2.0.1",
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