The most complete astronomical computation engine available as an MCP server. Open Ephemeris gives AI agents direct access to JPL DE440/DE441 ephemeris data — the same dataset used by NASA — for sub-arcsecond planetary precision and zero hallucination on dates, degrees, and positions. 50+ typed tools across every major astrological tradition: Western natal charts, transits, progressions, synastry, and composites; Human Design bodygraphs with gates, channels, and type analysis; Vedic/Jyotish with D-charts, dashas, and Ashtakavarga; Chinese BaZi Four Pillars; astrocartography power lines and local space; Venus Star Points; Arabic Parts; eclipse lookup; electional timing windows; and rendered chart wheels as native MCP images. All tools return structured JSON with format="llm" support for 50% smaller, token-efficient output. Free Explorer tier — no credit card required.
How to connect
https://server.smithery.ai/open-ephemeris/openephemeris/mcpcurl -X POST https://server.smithery.ai/open-ephemeris/openephemeris/mcp \
-H 'Content-Type: application/json' \
-H 'Accept: application/json, text/event-stream' \
-d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{}}'