Finally, trustworthy astrology in chat, with accurate data and interactive charts. Now a one-click app in the ChatGPT app directory, and a connector for Claude. For users: install, ask in plain language, then interact, learn, and grow. Trustworthy information where you already are. For developers: 120 REST endpoints, 92 typed MCP tools, the NASA JPL DE440 engine. Fast, accurate, sub-arcsecond ephemeris data. Build and integrate in minutes. Free to start, no card.
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Promoted
For anyone who wants to just try it instead of reading the pitch: openephemeris.com/astrology-mcp has a one-click "Add to Claude" that copies the connector URL and opens Claude's connector settings ready to paste.
Then ask something like "pull up my natal chart with Open Ephemeris — [your birth date, time, place]" and it renders right there, zoomable, with an "ask Claude to interpret this" button.
Also happy to dig into specifics if anyone's curious!