# Stellarium Web

A planetarium in the browser that shows the sky for any place and time, built on an open-source WebGL engine that you can embed in your own site.

- Category: Space and astronomy · by Stellarium Labs SRL
- Website: https://stellarium-web.org/
- Live data: yes
- Checked on the official pages: 2026-10-23

## API

- API unclear. Do not scrape the site; use it by hand or through its downloads.

## Data and license

- Download: https://github.com/Stellarium/stellarium-web-engine (source code)
- License: AGPL-3.0 or commercial licence (engine source) (https://github.com/Stellarium/stellarium-web-engine/blob/master/LICENSE-AGPL-3.0.txt); covers Stellarium Web Engine and web frontend source code; sky data come from third-party catalogues with their own credits
- Commercial use with conditions
- Credit: not stated
- Embedding with conditions
- Quote (embed): "Stellarium Web Engine is a JavaScript planetarium renderer using WebGL that can be embedded into a website." (https://github.com/Stellarium/stellarium-web-engine)
- Quote (commercial): "This program is licensed under the terms of the GNU AGPL v3, or alternatively under a commercial licence." (https://github.com/Stellarium/stellarium-web-engine/blob/master/src/core.c)
- Quote (maker): "Stellarium Web Engine - Copyright (c) 2022 - Stellarium Labs SRL" (https://github.com/Stellarium/stellarium-web-engine/blob/master/src/core.c)

## Rules for an agent

- There is no web API; to put a sky map in an app, build stellarium-web-engine (emscripten + scons, 'make js') and embed it, keeping AGPL-3.0 obligations or buying the commercial licence.
- Using the engine in a networked service triggers AGPL-3.0: publish your modified source, or obtain the commercial licence from Stellarium Labs
- Keep the data credits (Gaia/ESA, Hipparcos, DSS/STScI, IAU Minor Planet Center, NASA/JPL) shown in the app's Data Credits

Human page: https://agentgid.com/resources/stellarium-web/
Source: AgentGid (agentgid.com). Facts are quoted from the site's own pages; check the license page before you ship.