Open Ephemeris is a Model Context Protocol (MCP) server: Sub-arcsecond ephemeris and astrology on NASA JPL DE440: natal, transits, eclipses, Human Design. As an MCP server it plugs straight into AI assistants, exposing its functionality as tools the model can invoke on your behalf.
It's a hosted (remote) server — point your client at https://mcp.openephemeris.com/mcp and you're connected, with nothing to install locally. The current release is v1.0.0, published under the MIT license, with source at openephemeris/openephemeris-MCP on GitHub.
You'll find Open Ephemeris in the AI & Agents category here on mcp.site; it connects to Claude Desktop, Claude Code, Cursor, VS Code, Windsurf, Zed, and any other MCP client — see the install snippets below. If you maintain Open Ephemeris for openephemeris.com, claim this listing to verify ownership, earn the Verified badge, and keep the details current.
