openephemeris
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 analysi
openephemeris
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.
Installation
Specs
| Type | MCP server |
| Section | MCP servers |
| Pricing | free |
| Platform | Command line |
| Systems | cli, api |
| Hosting | cloud |
| Install | mcp |
| Protocols | mcp |
| Site language | en |
| Vendor | open-ephemeris |
