saju-bangwi.plusbeauxjours.com — data and asset credits
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Korean place coordinates (src/data/places.json, 167 시·군 + 특별·광역시/세종)
  Wikidata, property P625 (coordinate location). Wikidata data is CC0 1.0 (public domain dedication).
  https://www.wikidata.org/wiki/Wikidata:Licensing
  광주: 구 광주시청 coordinates (Kakao Local place search, quoted as a fact).

World city coordinates (src/data/world.json, 52 cities)
  Wikidata P625, CC0 1.0. Korean labels by plusbeauxjours.

Korea outline (src/data/korea-outline.json)
  Made with Natural Earth. Free vector and raster map data @ naturalearthdata.com (public domain).
  1:10m admin-0 countries, simplified.  https://www.naturalearthdata.com/about/terms-of-use/

Land outlines for the globe (public/land-110m.json)
  Made with Natural Earth (public domain). TopoJSON conversion: world-atlas v2 by Mike Bostock, ISC licence (below).

Solar terms table (src/data/jie.json)
  Computed at build time with astronomy-engine by Don Cross, MIT licence. Only the table ships.
  https://github.com/cosinekitty/astronomy
  Checked against 한국천문연구원(KASI) 천문우주지식정보 달력자료 2021–2028 (facts used with attribution).
  https://astro.kasi.re.kr/kor/life/post/calendarData

Lunar calendar table (src/data/lunar.json)
  Built at build time with korean-lunar-calendar by usingsky (KASI-based), MIT licence. Only the table ships.
  https://github.com/usingsky/korean_lunar_calendar_js
  Lunar month starts 2026–2028 checked against KASI 달력자료.

Korean civil time history (src/data/kr-offsets.json)
  IANA tz database (public domain), zone Asia/Seoul.

Folk calendar facts
  삼재: 한국민족문화대백과사전 「삼재(三災)」; 손 없는 날 (definition): 국립민속박물관 한국민속대백과사전
  (공공누리 제2유형: facts referenced, no text copied). 대장군·삼살: secondary sources listed on /about.

Fonts (SIL Open Font License 1.1)
  Pretendard (Kil Hyung-jin), self-hosted subset.
  Noto Serif KR (Google / Adobe), self-hosted subset of the 한자 used on the site.

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world-atlas — ISC License

Copyright 2013-2019 Michael Bostock

Permission to use, copy, modify, and/or distribute this software for any purpose
with or without fee is hereby granted, provided that the above copyright notice
and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
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
THIS SOFTWARE.

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astronomy-engine — MIT License, Copyright (c) 2019-2023 Don Cross
korean-lunar-calendar — MIT License, Copyright (c) usingsky

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.