MIT License

Copyright (c) 2018 Stanford Intelligent Systems Laboratory

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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Copyright (C) 2018
Standards Of Fundamental Astronomy Board
of the International Astronomical Union.

=====================
SOFA Software License
=====================

NOTICE TO USER:

BY USING THIS SOFTWARE YOU ACCEPT THE FOLLOWING SIX TERMS AND
CONDITIONS WHICH APPLY TO ITS USE.

1. The Software is owned by the IAU SOFA Board ("SOFA").

2. Permission is granted to anyone to use the SOFA software for any
    purpose, including commercial applications, free of charge and
    without payment of royalties, subject to the conditions and
    restrictions listed below.

3. You (the user) may copy and distribute SOFA source code to others,
    and use and adapt its code and algorithms in your own software,
    on a world-wide, royalty-free basis.  That portion of your
    distribution that does not consist of intact and unchanged copies
    of SOFA source code files is a "derived work" that must comply
    with the following requirements:

    a) Your work shall be marked or carry a statement that it
    (i) uses routines and computations derived by you from
    software provided by SOFA under license to you; and
    (ii) does not itself constitute software provided by and/or
    endorsed by SOFA.

    b) The source code of your derived work must contain descriptions
    of how the derived work is based upon, contains and/or differs
    from the original SOFA software.

    c) The names of all routines in your derived work shall not
    include the prefix "iau" or "sofa" or trivial modifications
    thereof such as changes of case.

    d) The origin of the SOFA components of your derived work must
    not be misrepresented;  you must not claim that you wrote the
    original software, nor file a patent application for SOFA
    software or algorithms embedded in the SOFA software.

    e) These requirements must be reproduced intact in any source
    distribution and shall apply to anyone to whom you have
    granted a further right to modify the source code of your
    derived work.

    Note that, as originally distributed, the SOFA software is
    intended to be a definitive implementation of the IAU standards,
    and consequently third-party modifications are discouraged.  All
    variations, no matter how minor, must be explicitly marked as
    such, as explained above.

4. You shall not cause the SOFA software to be brought into
    disrepute, either by misuse, or use for inappropriate tasks, or
    by inappropriate modification.

5. The SOFA software is provided "as is" and SOFA makes no warranty
    as to its use or performance.   SOFA does not and cannot warrant
    the performance or results which the user may obtain by using the
    SOFA software.  SOFA makes no warranties, express or implied, as
    to non-infringement of third party rights, merchantability, or
    fitness for any particular purpose.  In no event will SOFA be
    liable to the user for any consequential, incidental, or special
    damages, including any lost profits or lost savings, even if a
    SOFA representative has been advised of such damages, or for any
    claim by any third party.

6. The provision of any version of the SOFA software under the terms
    and conditions specified herein does not imply that future
    versions will also be made available under the same terms and
    conditions.

In any published work or commercial product which uses the SOFA
software directly, acknowledgement (see www.iausofa.org) is
appreciated.

Correspondence concerning SOFA software should be addressed as
follows:

By email:  sofa@ukho.gov.uk
By post:   IAU SOFA Center
            HM Nautical Almanac Office
            UK Hydrographic Office
            Admiralty Way, Taunton
            Somerset, TA1 2DN
            United Kingdom