Open Source Licenses & Credits

Credits and original license notices for the calculation sources and reading content used by Celesthread.

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View individual tarot artwork sources and file records

CELESTHREAD - CALCULATION AND CONTENT NOTICES
Published September 16, 2026

These notices cover the calculation sources and reading content listed below. They do not replace notices included with other app dependencies. The original licenses govern their respective components; no endorsement is implied.

Astronomy Engine 2.1.19
Source: https://github.com/cosinekitty/astronomy

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.

lunar-javascript 1.7.7
Source: https://github.com/6tail/lunar-javascript

MIT License

Copyright (c) 2018 6tail

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.

Tu Vi core calculation: doanguyen/lasotuvi
Source: https://github.com/doanguyen/lasotuvi/tree/ace8379a3ea033674e8a9096f5b98a9e2041eace

MIT License

Copyright (c) 2016 doanguyen

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.

Vietnamese lunar calendar: hnthap/lunar-calendar-api
Source: https://github.com/hnthap/lunar-calendar-api/tree/6e7dbc7c091d958095dcd3b0b8deadd556a05d7a

Copyright (c) 2026 Huynh Nhan Thap

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.

Tu Vi adaptation scope
Only calculation functions from AmDuong.py, DiaBan.py and App.py are adapted from lasotuvi. Its Gregorian/lunar calendar implementation and interpretive corpus are not included. Six unchanged TypeScript files from the separately credited hnthap calendar implementation are vendored; the application adapter is separate.

Tarot illustrations
Historical Rider-Waite-Smith card faces by Pamela Colman Smith (1878-1951). The Wikimedia Commons source records identify the selected Pam-A scans as public domain. Individual source pages, public-domain markings and distributed image SHA-256 hashes are preserved at https://celesthread.com/tarot-classic/sources.json. This attribution does not grant rights in later commercial recolorings or editions. Card backs and interface presentation are separate from the historical faces.

Personality questionnaire
The Big Five questionnaire uses public-domain International Personality Item Pool (IPIP) statements and scoring keys: https://ipip.ori.org/New_IPIP-50-item-scale.htm . The four-preference and story prompts are original informal reflections, not the official MBTI assessment or copied Kokology questionnaires.