Lepus - credits and third-party notices
=======================================

Every source of the data and code Lepus ships, with its licence and the credit it asks for
(evidence: docs/LICENSES.md, docs/PERMISSIONS.md and data/cleared.txt in the source tree).

Stars: Henry Draper Catalogue, Annie J. Cannon & E. C. Pickering, Harvard Annals 91-99;
  digital file via NASA ADC / CDS, Strasbourg, France (III/135A) (public domain; cut and precessed by Lepus).
Star names: IAU WGSN (credit: IAU), CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/).
  https://www.iau.org/WG280/WG280/Home.aspx  No endorsement by the IAU is implied.
  data/star_names_hd.csv is a selection of the WGSN list, keyed by HD number by Lepus.
Constellation figures (keyed by HD number), bookmarks, visitors and minor-body lists: own data (bomb).
Sky colour, solar spectrum (Solar Spectral Irradiance CDR v03r00, https://www.ncei.noaa.gov/products/climate-data-records/solar-spectral-irradiance):
  Odele Coddington, Judith L. Lean, Chris Lindholm, Peter Pilewskie. (2024). NOAA Climate Data Record (CDR) of NASA NOAA
  LASP Spectral Solar Irradiance (NNLSSI), Version 3. ssi_v03r00_yearly_s1610_e2025_c20260305.nc, yearly means 2009-2019.
  NOAA National Centers for Environmental Information. https://doi.org/10.25921/esjz-1w61. Accessed 2026-10-23.
  (US Government work; binned to 5 nm by Lepus). No endorsement by NOAA is implied.
Sun, Moon and planets: positions by Astronomy Engine (Don Cross, MIT; notice below).
Delta T (Earth rotation): L. V. Morrison, F. R. Stephenson, C. Y. Hohenkerk and M. Zawilski (2021), Addendum 2020
  to 'Measurement of the Earth's rotation: 720 BC to AD 2015', Proc. R. Soc. A 477: 20200776,
  https://doi.org/10.1098/rspa.2020.0776; spline coefficients from its Supplement Table S5
  (https://doi.org/10.6084/m9.figshare.13885863.v2), CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/).
  Lepus compiles the coefficients into its code, reformatted only, values unchanged. Outside the spline:
  F. R. Stephenson, L. V. Morrison and C. Y. Hohenkerk (2016), Proc. R. Soc. A 472: 20160404, equation 4.1.
Leap seconds: IANA tzdb leap-seconds.list (IERS Bulletin C, https://data.iana.org/time-zones/tzdb/leap-seconds.list),
  public domain; the dates are compiled into Lepus's code.
Moon surface: NASA/GSFC/Arizona State University, LROC WAC Empirically Normalized Reflectance (Sato et al.), via PDS; public domain (https://lroc.im-ldi.com/about/terms). No endorsement by NASA is implied.
Cities: GeoNames (https://www.geonames.org/), cities1000, CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/);
  selected and reformatted by Lepus.
Country names: Unicode CLDR 48.2.0 (https://cldr.unicode.org/, package cldr-localenames-full),
  Unicode License v3; the notice is below. The country of a time zone: IANA tzdb zone.tab, public domain.
Time zone rules: IANA Time Zone Database (tzdb), public domain.
Time zone boundaries: Contains information from timezone-boundary-builder
  (https://github.com/evansiroky/timezone-boundary-builder), which is made available here under the
  Open Database License (ODbL) (https://opendatacommons.org/licenses/odbl/1-0/).
  Built from OpenStreetMap data: © OpenStreetMap contributors (https://www.openstreetmap.org/copyright),
  available under the Open Database License (ODbL).
Colour-matching functions (star and sky colours): CIE 2019, Colour-matching functions of CIE 1931
  standard colorimetric observer, CIE, Vienna, DOI 10.25039/CIE.DS.xvudnb9b
  (https://doi.org/10.25039/CIE.DS.xvudnb9b), CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/).
  Lepus uses every fifth row (5 nm) of the 1 nm table.
Cloud climatology (cloud genera and cover): C. J. Hahn and S. G. Warren, Extended Edited Cloud Report
  Archive (EECRA), NCAR GDEX d292002, DOI 10.5065/VA78-8E98 (https://doi.org/10.5065/VA78-8E98),
  CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Lepus uses a gridded climatology reduced from it.
Deep-sky objects (clusters, nebulae, galaxies): OpenNGC by Mattia Verga
  (https://github.com/mattiaverga/OpenNGC, commit be3cd6c5498806a2fbb2f7e0452ef802dbb02be0),
  CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/). data/deep_sky.csv is a selection of its
  rows and columns (tools/openngc_cut.py) and is offered under the same licence.
Natural night sky (zodiacal light, airglow, faint starlight): own model from published numbers, no data file.
  Zodiacal light table and units: Leinert et al. 1998, A&AS 127, 1 "The 1997 reference of diffuse night sky
  brightness". Airglow and the dark-sky budget: Benn & Ellison 1998, New Astron. Rev. 42, 503; Patat 2003,
  A&A 400, 1183; Krisciunas 1997, PASP 109, 1181; Noll et al. 2012, A&A 543, A92. Solar-cycle minima: NOAA SWPC
  observed solar cycle indices, Wikipedia "Solar cycle 24" and "Solar cycle 25". Luminance scale: Crumey 2014, MNRAS.
Methods and constants (published works; numbers and formulas only, no data file and no code taken):
  Sky colour: E. Bruneton, Precomputed Atmospheric Scattering demo (2017,
  https://github.com/ebruneton/precomputed_atmospheric_scattering) and S. Hillaire, UnrealEngineSkyAtmosphere
  sample (2020, https://github.com/sebh/UnrealEngineSkyAtmosphere); air density: U.S. Standard Atmosphere 1976
  (NOAA/NASA/USAF), public domain.
  Ozone absorption: own fit (tools/ozone_fit.py) to Burkholder & Talukdar 1994, Geophys. Res. Lett. 21, 581, and
  Brion et al. 1998, J. Atmos. Chem. 30, 291.
  Long-term precession: Vondrak, Capitaine and Wallace 2011, A&A 534, A22 (https://doi.org/10.1051/0004-6361/201117274),
  corrected by A&A 541, C1 (2012).
Code: ERFA (BSD-3-Clause) and Astronomy Engine (MIT); their notices follow.


Unicode CLDR (country names) - Unicode License V3
-------------------------------------------------
UNICODE LICENSE V3

COPYRIGHT AND PERMISSION NOTICE

Copyright © 2004-2026 Unicode, Inc.

NOTICE TO USER: Carefully read the following legal agreement. BY
DOWNLOADING, INSTALLING, COPYING OR OTHERWISE USING DATA FILES, AND/OR
SOFTWARE, YOU UNEQUIVOCALLY ACCEPT, AND AGREE TO BE BOUND BY, ALL OF THE
TERMS AND CONDITIONS OF THIS AGREEMENT. IF YOU DO NOT AGREE, DO NOT
DOWNLOAD, INSTALL, COPY, DISTRIBUTE OR USE THE DATA FILES OR SOFTWARE.

Permission is hereby granted, free of charge, to any person obtaining a
copy of data files and any associated documentation (the "Data Files") or
software and any associated documentation (the "Software") to deal in the
Data Files or Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, and/or sell
copies of the Data Files or Software, and to permit persons to whom the
Data Files or Software are furnished to do so, provided that either (a)
this copyright and permission notice appear with all copies of the Data
Files or Software, or (b) this copyright and permission notice appear in
associated Documentation.

THE DATA FILES AND SOFTWARE ARE 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 OF
THIRD PARTY RIGHTS.

IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS INCLUDED IN THIS NOTICE
BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES,
OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THE DATA
FILES OR SOFTWARE.

Except as contained in this notice, the name of a copyright holder shall
not be used in advertising or otherwise to promote the sale, use or other
dealings in these Data Files or Software without prior written
authorization of the copyright holder.

SPDX-License-Identifier: Unicode-3.0


ERFA - BSD-3-Clause
-------------------
Lepus uses code derived from ERFA 2.0.1, which is derived from SOFA; it is not SOFA.

Copyright (C) 2013-2023, NumFOCUS Foundation.
All rights reserved.

This library is derived, with permission, from the International
Astronomical Union's "Standards of Fundamental Astronomy" library,
available from http://www.iausofa.org.

The ERFA version is intended to retain identical functionality to
the SOFA library, but made distinct through different function and
file names, as set out in the SOFA license conditions.  The SOFA
original has a role as a reference standard for the IAU and IERS,
and consequently redistribution is permitted only in its unaltered
state.  The ERFA version is not subject to this restriction and
therefore can be included in distributions which do not support the
concept of "read only" software.

Although the intent is to replicate the SOFA API (other than
replacement of prefix names) and results (with the exception of
bugs;  any that are discovered will be fixed), SOFA is not
responsible for any errors found in this version of the library.

If you wish to acknowledge the SOFA heritage, please acknowledge
that you are using a library derived from SOFA, rather than SOFA
itself.


TERMS AND CONDITIONS

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

1 Redistributions of source code must retain the above copyright
  notice, this list of conditions and the following disclaimer.

2 Redistributions in binary form must reproduce the above copyright
  notice, this list of conditions and the following disclaimer in
  the documentation and/or other materials provided with the
  distribution.

3 Neither the name of the Standards Of Fundamental Astronomy Board,
  the International Astronomical Union nor the names of its
  contributors may be used to endorse or promote products derived
  from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.


Astronomy Engine - MIT License
------------------------------

MIT License

Copyright (c) 2019-2023 Don Cross <cosinekitty@gmail.com>

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.
