Credits

Every library and every data file used to make the maps is listed here, with the licence we rely on.

Data

Name	Licence	Used for
GeoNames	CC BY 4.0	Towns, coordinates, and time zones. The file public/data/places.json is derived from the cities5000, admin1, and country tables.
HYG Database v4.0	CC BY-SA 4.0	Star positions, brightness, colour, constellation, and proper names. Compiled by David Nash (astronexus). public/data/stars.json is a filtered extract and stays under CC BY-SA 4.0.

Name	Licence	Used for
Fraunces	SIL Open Font License 1.1	Headlines and several posters. Designed by Undercase Type. The font files are part of this site. The browser does not call Google.
Outfit	SIL Open Font License 1.1	Interface and small labels. Designed by Rodrigo Fuenzalida.
Cormorant Garamond	SIL Open Font License 1.1	Wedding and gallery posters. Designed by Christian Thalmann.
Nunito	SIL Open Font License 1.1	The nursery poster. Designed by Vernon Adams.

Name	Licence	Used for
next16.4.0	MIT	The site framework. Pages are exported as static files.
react19.3.0	MIT	Interface.
react-dom19.3.0	MIT	Interface.
astronomy-engine2.1.19	MIT	Moon and planet positions, and the rotation from star coordinates to the local sky. The planetary tables travel inside this MIT-licensed package.
pdf-lib1.17.1	MIT	Print-ready PDF files, built in the browser.
lucide-react1.54.0	ISC	Small interface icons.
@radix-ui/react-dialog1.2.0	MIT	The unlock window and the mobile menu.
@radix-ui/react-accordion1.2.21	MIT	The question list.
@radix-ui/react-label2.1.16	MIT	Form labels.
@radix-ui/react-separator1.1.16	MIT	Dividers.
@radix-ui/react-slot1.4.0	MIT	Buttons that can also be links.
class-variance-authority0.7.1	Apache-2.0	Button styles.
clsx2.1.1	MIT	Class names.
tailwind-merge3.7.0	MIT	Class names.
tailwindcss4.3.3	MIT	Build tool for the layout styles. It is not loaded as a separate script.
typescript5.9.3	Apache-2.0	Build tool. It is not shipped to the browser.
vitest3.2.7	MIT	Tests for time zones and sky positions. Not shipped to the browser.
@tailwindcss/turbopack4.3.3	MIT	Build tool that turns the style sheet into CSS. Not shipped as a separate script.
eslint9.39.5	MIT	Checks the source. Not shipped to the browser.
eslint-config-next16.4.0	MIT	Lint rules for the framework. Not shipped to the browser.
@types/node20.19.43	MIT	Type declarations for the build. Not shipped.
@types/react19.3.0	MIT	Type declarations for React. Not shipped.
@types/react-dom19.3.0	MIT	Type declarations for React DOM. Not shipped.

The poster drawings, including constellation lines, are our own. The lines follow traditional Western figures and were written for this project. They are not taken from another star-map program.
The Milky Way on the darker designs is a soft band calculated from each star’s place in the sky and the standard north galactic pole. It is not a photograph and not a separate catalogue.
Paper grain, foil-gold rings, and watercolour washes are drawn in the browser for each poster. The framed pictures used in the shop images are drawn the same way. No stock photographs are used.