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. Atlas datasets: Olaf Frohn / d3-celestial, BSD-3-Clause. Stars: XHIP, Anderson & Francis (2012), V/137D. Boundaries: Davenhall & Leggett (1989), CDS VI/49, J2000. Figure topology is a chosen illustration, not an IAU standard. Local magnitude <=7 subset; figures/labels cleaned and Serpens components combined. Original J2000 boundary samples reordered using constellation polygon topology. https://github.com/ofrohn/d3-celestial https://cdsarc.cds.unistra.fr/ftp/VI/49/ The MIT License Copyright © 2010-2026 three.js authors 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. 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. Star catalogue: IAU Working Group on Star Names (WGSN), IAU Catalog of Star Names, 2022-04-04. Creative Commons Attribution. https://www.pas.rochester.edu/~emamajek/WGSN/IAU-CSN.txt Planet surface maps and Saturn rings: Solar System Scope. https://www.solarsystemscope.com/textures/ — Creative Commons Attribution 4.0: https://creativecommons.org/licenses/by/4.0/ . Images resized and compressed. Illustrative maps include artistic colour adjustments. Saturn poster: a rendered illustration using these maps, dated 2026-10-23, not a current sky view. Eagle Nebula NASA, ESA/Hubble and the Hubble Heritage Team https://esahubble.org/images/heic1501a/ Creative Commons Attribution 4.0. Photographs resized and WebP-compressed; thumbnails resized. Files: eagle.webp, eagle-thumb.webp Ring Nebula NASA, ESA, and C. Robert O’Dell (Vanderbilt University). https://esahubble.org/images/heic1310a/ Creative Commons Attribution 4.0. Photographs resized and WebP-compressed; thumbnails resized. Files: ring.webp, ring-thumb.webp Crab Nebula NASA, ESA and Allison Loll/Jeff Hester (Arizona State University). Acknowledgement: Davide De Martin (ESA/Hubble) https://esahubble.org/images/heic0515a/ Creative Commons Attribution 4.0. Photographs resized and WebP-compressed; thumbnails resized. Files: crab.webp, crab-thumb.webp Sombrero Galaxy NASA/ESA and The Hubble Heritage Team (STScI/AURA) https://esahubble.org/images/opo0328a/ Creative Commons Attribution 4.0. Photographs resized and WebP-compressed; thumbnails resized. Files: sombrero.webp, sombrero-thumb.webp Carina Nebula NASA, ESA, N. Smith (University of California, Berkeley), and The Hubble Heritage Team (STScI/AURA) https://esahubble.org/images/heic0707a/ Creative Commons Attribution 4.0. Photographs resized and WebP-compressed; thumbnails resized. Files: carina.webp, carina-thumb.webp Western Veil Nebula NASA, ESA, Hubble Heritage Team https://esahubble.org/images/heic1520a/ Creative Commons Attribution 4.0. Photographs resized and WebP-compressed; thumbnails resized. Files: veil.webp, veil-thumb.webp Cat’s Eye Nebula ESA, NASA, HEIC and The Hubble Heritage Team (STScI/AURA) https://esahubble.org/images/heic0414a/ Creative Commons Attribution 4.0. Photographs resized and WebP-compressed; thumbnails resized. Files: cats-eye.webp, cats-eye-thumb.webp Orion Nebula NASA , ESA , M. Robberto ( Space Telescope Science Institute / ESA ) and the Hubble Space Telescope Orion Treasury Project Team https://esahubble.org/images/heic0601a/ Creative Commons Attribution 4.0. Photographs resized and WebP-compressed; thumbnails resized. Files: orion.webp, orion-thumb.webp Andromeda Galaxy NASA , ESA , J. Dalcanton (University of Washington, USA), B. F. Williams (University of Washington, USA), L. C. Johnson (University of Washington, USA), the PHAT team, and R. Gendler. https://esahubble.org/images/heic1502a/ Creative Commons Attribution 4.0. Photographs resized and WebP-compressed; thumbnails resized. Files: andromeda.webp, andromeda-thumb.webp Whirlpool Galaxy NASA , ESA , S. Beckwith ( STScI ), and The Hubble Heritage Team ( STScI / AURA ) https://esahubble.org/images/heic0506a/ Creative Commons Attribution 4.0. Photographs resized and WebP-compressed; thumbnails resized. Files: whirlpool.webp, whirlpool-thumb.webp Earth cloud texture: NASA Visible Earth / NASA Goddard Space Flight Center, Blue Marble cloud composite, published 2002. Source: https://eoimages.gsfc.nasa.gov/images/imagerecords/57000/57747/cloud_combined_2048.jpg . Converted to grayscale WebP for the transparency layer. Historical composite, not weather at the selected date. NASA media usage: https://www.nasa.gov/nasa-brand-center/images-and-media/ . No endorsement is implied. Constellation name origins: Wolbach Library, Harvard-Smithsonian Center for Astrophysics, compilation by Cayla Cummings. https://library.cfa.harvard.edu/iau-constellations . Factual history groups paraphrased; reference star directions and magnitudes use the credited local XHIP/IAU catalogues. Full CC BY 4.0 legal text: assets/license-cc-by.txt. Image providers do not endorse this observatory.