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astronomy mcp server MCP

v0.5.0 changelog · 8

io.github.cyanheads/astronomy-mcp-server

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

transport:streamable-http runtime:npm tools:7

Target client

run in your project directory

claude mcp add --transport http astronomy-mcp-server https://astronomy.caseyjhand.com/mcp

setup guides: Claude Code Claude Desktop Cursor VS Code Zed Windsurf Cline Gemini CLI Grok ChatGPT Claude.ai LangChain

Adds it for this project only. Append --scope user to make it available everywhere. Claude Code docs

astronomy_get_sky_position

astronomy get sky position

astronomy_get_rise_set

astronomy get rise set

astronomy_get_moon_phase

astronomy get moon phase

astronomy_find_events

astronomy find events

astronomy_list_visible

astronomy list visible

astronomy_get_ephemeris

astronomy get ephemeris

astronomy_get_satellite_passes

astronomy get satellite passes

All 7 tools, one page each

1 prompt you invoke yourself

11 resources you attach as context

Mutating and Read-only are read off each tool's name, not its schema — a hint, not a guarantee. Check the server's own documentation before granting access.