# Third-party notices and data provenance CycleCalcs incorporates third-party software and data. This file reproduces, in full, every license that requires reproduction, and records the provenance of every dataset named in CREDITS.md, verified against the files this repository actually ships. CREDITS.md points here. A machine-readable form of the same rights position is served from `GET /v2/attribution`, and the plain-language version for API callers is at `/api/terms.html`. --- ## PART 1. LICENSES REPRODUCED IN FULL ### 1.1 Astronomy Engine (MIT) Vendored at `netlify/lib/vendor/astronomy-engine.mjs` and `assets/vendor/astronomy.browser.min.js`, version 2.1.19. This is the astronomy library behind every computed value the site and the API return. Upstream: https://github.com/cosinekitty/astronomy The vendored file's own notice, reproduced in full and unedited: MIT License Copyright (c) 2019-2023 Don Cross 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. The "2019-2023" year range above is printed in the vendored file itself and is reproduced unchanged. It is older than the current year because the notice obligation attaches to the copy this repository redistributes, not to whatever copyright line the upstream project carries today. Serving computed output over HTTP is not distributing this Software; the MIT license has no network clause, so an API response built with this engine carries no MIT obligation of its own. See PART 3. ### 1.2 d3-celestial (BSD-3-Clause) Data derived from d3-celestial ships in four places: - `assets/data/constellation-lines.json`, the 88-constellation figure lines - `assets/data/milkyway.json`, the Milky Way isophote outline (see the open item in PART 4: d3-celestial attributes this specific dataset to a third party, Jose R. Vieira, whose own license position is unresolved) (`assets/data/sky-stars-deep.json` NO LONGER comes from d3-celestial. It was built from d3-celestial's `stars.8.json`, which carries the XHIP compilation and so ESA astrometry; it is now built from the SAO catalog. See PART 2.1.) - `assets/data/messier.json`, the base layer of designation, type, magnitude, angular size and coordinates for the Messier and Caldwell objects Upstream: https://github.com/ofrohn/d3-celestial Full text, reproduced because BSD-3-Clause clause 2 requires reproduction rather than a bare citation: Copyright (c) 2015, Olaf Frohn All rights reserved. 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 copyright holder 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. Olaf Frohn does not endorse CycleCalcs. Clause 3 above forbids using his name or the d3-celestial name to suggest otherwise. ### 1.3 GeoNames place index (CC BY 4.0) Backs `GET /v2/places` and the `place` parameter accepted by every location-taking `/v2` endpoint, generated into `netlify/lib/v2/data/places-top.mjs` and `places-rest.mjs`; the site's own place search uses the sibling reduction in `assets/data/cities-top.txt` and `assets/data/cities-rest.txt`. Source: https://download.geonames.org/export/dump/ Terms: https://www.geonames.org/about.html: "available for download free of charge under a creative commons attribution license" License: CC BY 4.0, https://creativecommons.org/licenses/by/4.0/ Attribution is a condition of this license, not a courtesy, and it is discharged per response rather than once for the whole API: any `/v2` response that resolves a place name carries `meta.rights` of `"attribution_required"` and the exact required credit line in `meta.attribution.text` and in `meta.attribution.sources`. That credit line, reproduced here verbatim because it is the string the API actually emits: > "Place names and coordinates from GeoNames (geonames.org), CC BY 4.0." A response that does not resolve a place name carries `meta.rights` of `"unrestricted"` and owes GeoNames nothing, because it never touched the index. See `/api/terms.html` for what this means for a caller. ### 1.4 Typefaces: Marcellus and Inter (SIL Open Font License 1.1) Both are vendored as base64 inside importable `.mjs` modules, because the no-build deploy never runs `npm install` and the function bundle has no file access. | Family | Vendored at | License text at | Used by | |---|---|---|---| | Marcellus Regular | `netlify/lib/vendor/marcellus-font.mjs` | `netlify/lib/vendor/marcellus-OFL.txt` | display type in both calendar PDFs | | Inter Regular, Inter SemiBold | `netlify/lib/vendor/inter-font.mjs` | `netlify/lib/vendor/inter-OFL.txt` | all text and data type in the press calendar | Sources, with the hashes the modules assert at import: - Marcellus: google/fonts `ofl/marcellus`, `Marcellus-Regular.ttf`. - Inter: github.com/rsms/inter release **v4.1**, `Inter-4.1.zip` (sha256 `9883fdd4a49d4fb66bd8177ba6625ef9a64aa45899767dde3d36aa425756b11e`), files `extras/ttf/Inter-Regular.ttf` (sha256 `40d692fc…`) and `extras/ttf/Inter-SemiBold.ttf` (sha256 `78a843fa…`). The full digests are exported from the module and checked by `tools/press-smoke.mjs`. **Why the license files travel with the font data.** The OFL permits embedding a font in a document without the document becoming subject to the license, so a customer's calendar PDF carries subsetted outlines and owes nothing further. Redistribution of the font data *itself* — which is exactly what this repository does — is the case the license does govern, and it requires the license and copyright notice to travel with the files. That is what the two `-OFL.txt` files are for; neither may be removed while the corresponding `.mjs` is present. Neither license requires attribution in the rendered output, so the printed calendar carries no font credit and `GET /v2/attribution` is unaffected. --- ## PART 2. OTHER DATASETS NAMED IN CREDITS.md None of the entries below requires reproduction of license text (the underlying licenses are short permissive grants, public domain notices, or, in one case, an open question rather than a grant). Each is recorded here because CREDITS.md names it, verified against the files this repository actually ships as of this notice. ### 2.1 Star catalogs (NASA HEASARC) - CLOSED, formerly ESA Hipparcos Files: `assets/data/sky-stars.json`, `assets/data/sky-stars2.json`, `assets/data/star-names.json` and `assets/data/constellations.json` (naked-eye star positions, magnitudes, color index, the name-to-star join and per-constellation metadata), plus `assets/data/sky-stars-deep.json` (the binocular-depth tier), plus `netlify/lib/v2/data/star-targets.json` (the named-star targets of the v2 API: for the stars its own selection block lists, the J2000 place at the catalog's precision, proper motion, parallax, radial velocity and V magnitude, built by `tools/generate-star-targets.py`). All are generated at build time and none redistributes a catalog in raw form. Sources, both served by NASA's High Energy Astrophysics Science Archive Research Center: - **Bright Star Catalog, 5th Revised Ed. (Preliminary)**, Hoffleit, D. and Warren, Jr., W.H., 1991. Naked-eye stars. https://heasarc.gsfc.nasa.gov/W3Browse/star-catalog/bsc5p.html - **Smithsonian Astrophysical Observatory Star Catalog**, SAO Staff 1966, J2000 revision. The depth tier fainter than magnitude 6.5. https://heasarc.gsfc.nasa.gov/W3Browse/star-catalog/sao.html Neither HEASARC page asserts any copyright, license or usage restriction, and both tables declare `table_security = public` in the data files themselves. The quantities used are positions, magnitudes, color indices and catalog cross-identifiers: measurements of the sky rather than authorship. Credit is given here because crediting a source is right even where no license compels it. **THIS ITEM WAS PREVIOUSLY OPEN AND IS NOW CLOSED.** These files were built from the ESA Hipparcos Catalogue, and `sky-stars-deep.json` from the XHIP compilation by way of d3-celestial, which is the same ESA observations at one remove. ESA licenses Hipparcos under **CC BY-NC 3.0 IGO** and requires written authorization for any use that "directly or indirectly generates a financial gain". This site carries advertising and sells API access, so that term could not be satisfied by a credit line. No authorization was sought; the dependency was removed instead. No ESA measurement remains in any shipped file: every position, magnitude and color now comes from BSC5P or SAO. What does remain, and is described exactly rather than glossed over, is the identifier column noted in 2.2.1 below. Deep-tier color is an **estimate, not a measurement**, and the payload says so: SAO carries no B-V, so `sky-stars-deep.json` sets `bv_source: "spectral_type_estimate"` and the value is derived from the star's spectral type. The naked-eye tiers use BSC5P's measured B-V. #### 2.2.1 What is still Hipparcos-shaped, stated precisely Two residues remain. Both are deliberate, and this section replaced an earlier sentence claiming that no file in `assets/data/` derived from ESA data "in any amount", which was simply not true of the first of them. **HIP identifiers, 532 of them.** `assets/data/star-names-index.json` carries a Hipparcos catalogue NUMBER per named star, in its second column, and `star-names.html` deep-links on it (`#32349`). That is a reference to a catalog entry, not a measurement taken from one: no ESA position, magnitude, parallax or color is stored beside it, and the astrometry those rows display comes from BSC5P and SAO. An identifier that names a row is the part of a catalog that has to be quotable for anyone to cite it, and the CC BY-NC term above is about USE of the catalog's content. The number is kept because it is the identifier astronomers and other catalogs actually cross-reference by, and removing it would strand every star page's stable anchor. Note it is NOT the identifier the sky map selects on: that moved to HR precisely so an old HIP link could not silently resolve to a different star. **Twenty-one quoted distances.** `tools/constellation-facts.mjs` carries hand-curated `distLy` values for individual bright stars, cited as "Hipparcos/Gaia values as commonly quoted". Those are individual published quantities quoted as facts, not an extraction from a database, and the per-star distance of Betelgeuse is not a protectable element of anyone's catalog. Naming the measuring mission is a citation. ### 2.2 NOAA Space Weather Prediction Center File: `assets/js/sunspot-planets.js` (yearly mean total sunspot number). Source: https://www.swpc.noaa.gov/products/solar-cycle-progression License: United States Government work, public domain (17 U.S.C. 105). No attribution condition; credited as good practice and for provenance. ### 2.3 Wikipedia, "List of Messier objects" Used at build time only, as a cross-validation source in `tools/build-messier-facts.mjs`: only uncopyrightable measurements (NGC identifier, distance, common name) are taken, and each is checked against an independent source before it ships. Source: https://en.wikipedia.org/wiki/List_of_Messier_objects License: the article text is CC BY-SA 4.0. The values taken here are facts, not the licensed prose; credited as good practice. ### 2.4 IAU Catalog of Star Names (IAU Working Group on Star Names, WGSN) Files: `tools/star-names-wgsn.json`, `assets/data/star-names.json`, `assets/data/star-names-index.json`, `netlify/lib/v2/data/star-targets.json` (the names the v2 API accepts as star: targets and returns on their rows). Source: https://exopla.net/star-names/modern-iau-star-names/ (an IAU-data mirror; recorded as the source in the fetched file itself) License: CC BY 4.0. The IAU states: "All IAU-produced products (Images, Videos, Texts) are released under Creative Commons Attribution (i.e. free to use in all perpetuity, world-wide, as long as the source is mentioned)." Credit: "Star names: IAU Catalog of Star Names (IAU-CSN), IAU Working Group on Star Names (WGSN). International Astronomical Union, CC BY 4.0." ### 2.5 International Meteor Organization Working List of Visual Meteor Showers Files: `assets/js/meteors.js`, `tools/meteor-catalog.mjs` (peak solar longitudes, radiants, drifts, ZHR values and entry speeds, cross-checked against the American Meteor Society calendar). Source: https://www.imo.net/resources/calendar/ License position: the IMO publishes no commercial redistribution grant and asserts copyright in its website text, graphics and table layout. The values taken here are astronomical parameters, independently tabulated in this repository's own files rather than reproduced as the IMO's table; no IMO prose, graphic or table layout ships. Credited as good practice and for provenance. ### 2.6 International Earth Rotation and Reference Systems Service (IERS) Files: `netlify/lib/deltat.mjs` and `assets/js/deltat.js` (delta-T, TT minus UT1, sampled from 1972 to the end of the current prediction), built by `tools/build-deltat.mjs`. Sources: the IERS EOP 20 C04 series (EOP Product Center, Paris Observatory), the IERS Rapid Service finals and IERS Bulletin A (IERS Rapid Service/Prediction Center, U.S. Naval Observatory), from https://datacenter.iers.org/. The bulletin issue and the last date of each series are recorded in the files. License position: published measurements and predictions of the Earth's rotation. The values taken are sampled values of UT1 minus UTC combined with the leap-second record; no IERS document, table layout or text ships. Credited as good practice and for provenance. --- ## PART 3. RIGHTS IN COMPUTED OUTPUT Values computed by this software (positions, phases, rise and set times, twilight, eclipse circumstances, conjunctions, seasons, aspect angles and every other quantity CycleCalcs calculates rather than obtains from a third party) are facts about the physical universe. CycleCalcs LLC, a Virginia limited liability company, asserts no copyright and no database right in them. See LICENSE clause 3 for the repository-level grant, and `/api/terms.html` for the version published to API callers, which is kept byte-consistent with the `output_rights` string `GET /v2` publishes. The free one-year sample of the event database (edition sample-2027, made by `tools/build-event-sample.mjs`) goes further: its files themselves, including their selection, arrangement and README, are dedicated to the public domain under CC0 1.0 Universal (https://creativecommons.org/publicdomain/zero/1.0/), so they may be copied and republished as files. This is the grant in NOTICE.md that LICENSE clause 2 provides for. It does not extend to the paid event-database files, which may not be redistributed although the values in them stay public domain. --- ## PART 4. OPEN ITEMS Recorded openly rather than omitted. 1. ~~Hipparcos and Tycho are distributed by ESA under CC BY-NC 3.0 IGO.~~ **CLOSED.** The ESA dependency was removed rather than licensed: star data now comes from the Bright Star Catalog and the SAO catalog via NASA HEASARC, neither of which asserts a restriction. See PART 2.1. Kept here, struck through rather than deleted, so the history of the decision stays legible. 2. No license statement has been located for the Milky Way Outline Catalog attributed to Jose R. Vieira, which underlies `assets/data/milkyway.json` by way of d3-celestial's `mw.json`. d3-celestial's own BSD-3-Clause notice (PART 1.2) covers Olaf Frohn's compilation and cannot convey rights in an underlying catalog Frohn may not himself hold. Neither item currently blocks anything this repository ships to a browser or to the frozen `/v1` API. Both are recorded here so they are not lost, and so this file states the honest position rather than a convenient one.