io.github.cyanheads/astronomy-mcp-server

io.github.cyanheads/astronomy-mcp-server

Offline observational astronomy: positions, rise/set, moon phases, eclipses, and seasons.

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Connect this server

Add this to your MCP client config — claude_desktop_config.json (Claude Desktop) or .cursor/mcp.json (Cursor).Suits: Claude Desktop · Cursor.

{
  "mcpServers": {
    "astronomy-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/astronomy-mcp-server@0.5.0"
      ],
      "env": {
        "MCP_LOG_LEVEL": "info",
        "ASTRONOMY_ENABLE_HORIZONS": "false",
        "ASTRONOMY_ENABLE_SATELLITES": "false"
      }
    }
  }
}
Environment variables
  • MCP_LOG_LEVELSets the minimum log level for output (e.g., 'debug', 'info', 'warn').
  • ASTRONOMY_ENABLE_HORIZONSRegister the astronomy_get_ephemeris tool, which fetches small-body and spacecraft ephemerides from JPL Horizons. Off by default; the core is keyless and offline.
  • ASTRONOMY_ENABLE_SATELLITESRegister the astronomy_get_satellite_passes tool, which predicts visible satellite passes from CelesTrak GP element sets propagated with SGP4. Off by default.

A starting point — check the repository for exact arguments and setup. Restart your client after editing the config.

Category
Developer Tools
Version
0.5.0
Registry
active
Published
10/28/2026

Remotes

  • streamable-httphttps://astronomy.caseyjhand.com/mcp

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