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Agents tracked: 444 Releases (7d): 644 Agent status: 4 with issuesSince last limit reset: Claude 30d · Codex 3d Updated Oct 23, 2026
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Space and astronomy · by Stellarium Labs SRL

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.

Set any city and date and see the real sky, down to faint stars from the Gaia catalogue, without installing anything.

LiveDownloadCommercial: conditions

Open stellarium-web.org ↗ agent.md

For your project

Official API
API unclear
Data download
Yes source code
License
AGPL-3.0 or commercial licence (engine source) Stellarium Web Engine and web frontend source code; sky data come from third-party catalogues with their own credits
Commercial use
Commercial use with conditions
“This program is licensed under the terms of the GNU AGPL v3, or alternatively under a commercial licence.” github.com/Stellarium/stellarium-web-engine/blob/...
Credit
Not stated
Embedding
Embedding with conditions
“Stellarium Web Engine is a JavaScript planetarium renderer using WebGL that can be embedded into a website.” github.com/Stellarium/stellarium-web-engine
Using the website
Free

Read on Stellarium Web's own pages on Oct 23, 2026 · license or terms · API docs. Check the license page before you ship.

For your agent

No official API. An agent should not scrape the site: use it by hand or through its downloads.

  • 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

Paste into your agent: Read https://agentgid.com/resources/stellarium-web/agent.md before using Stellarium Web.

What you can build

  • An AGPL-licensed stargazing page that embeds the engine and highlights tonight's planets for the user's location
  • An astronomy-club event page that opens Stellarium Web at a set date and place
  • An open-source observing-log app with an embedded sky view

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Something wrong or out of date? Tell us.