# Star data and acknowledgements

Credit: ESA.
ESA, 1997, The Hipparcos and Tycho Catalogues, ESA SP-1200.
Hipparcos factual data are distributed under CC BY-NC 3.0 IGO.

This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France.

Proper star names: IAU Division C Working Group on Star Names, IAU Catalog of Star Names (IAU-CSN), CC BY with source attribution.
Japanese common names have been transcribed independently.

See [sources, retrieval methods, dates and remaining licensing limits](SOURCES.md).
The CDS redistribution-specific conditions for the 21 coordinate pairs in development test fixtures have not been independently confirmed.

The faint-star backdrop (`faint-stars.js`, 730 stars of 3.1 <= V < 4.5) is also derived from the Hipparcos Catalogue (Credit: ESA; ESA, 1997, ESA SP-1200; CC BY-NC 3.0 IGO). See [SOURCES.md](SOURCES.md).

The constellation line data (`constellations.js`, `constellation-stars.js`) also rests on Hipparcos positions (Credit: ESA; ESA, 1997, ESA SP-1200; CC BY-NC 3.0 IGO). The lines themselves were written by the app's author from star facts. See [SOURCES.md](SOURCES.md).

## Moon map (round 9)

`public/assets/moon-map.jpg` is NASA/GSFC Scientific Visualization Studio "CGI Moon Kit" (the 3840×1920 greyscale re-encode of "CGI Moon Kit - Lroc color poles", Lunar Reconnaissance Orbiter data), https://svs.gsfc.nasa.gov/4720. NASA imagery is not subject to copyright restrictions. Credit: NASA's Scientific Visualization Studio. Fetched on 2026-11-15 from the Wikimedia Commons copy (Public domain), https://commons.wikimedia.org/wiki/File:CGI_Moon_Kit_-_Lroc_color_poles.tif. Re-encoded only (greyscale JPEG). NASA does not endorse or sponsor this app; the use of NASA imagery does not imply NASA endorsement.

`public/assets/mars-map.jpg` is the NASA/JPL/USGS Viking "Mars MDIM 2.1 Colorized Global Mosaic" (the 1 km/pixel version, re-encoded to 2048×1024), https://astrogeology.usgs.gov/ . Public domain. Credit: NASA / Jet Propulsion Laboratory / USGS. Fetched on 2026-11-15 from the Wikimedia Commons copy (Public domain), https://commons.wikimedia.org/wiki/File:Mars_Viking_MDIM21_ClrMosaic_1km.jpg. Resized and re-encoded only. NASA and USGS do not endorse or sponsor this app; the use of NASA or USGS imagery does not imply NASA or USGS endorsement.

`public/assets/jupiter-map.jpg` is NASA/JPL/Space Science Institute Cassini PIA07782 "Cassini's Best Maps of Jupiter (Cylindrical Map)" (Dec 2000), via Wikimedia Commons, re-encoded to 2048×1024 with the two halves swapped. Public domain (NASA media). Credit: NASA/JPL/Space Science Institute. https://photojournal.jpl.nasa.gov/catalog/PIA07782