Open Ephemeris

Created By

Open Ephemeris13 days ago

Open Ephemeris is a production-grade MCP server that gives Claude, ChatGPT, Gemini, Cursor, and any MCP-compatible agent direct access to real astronomical data. Over 100 tools cover the full range of astrological traditions: natal chart calculation, transit and progression forecasting, synastry, astrocartography ACG lines, Human Design body graph, BaZi four pillars, eclipse windows, lunar phases, planetary hours, and fixed star positions. All positions are computed at request time from JPL DE440 — accurate to arc-second precision. No hallucinated positions. No astronomy math in your application code. Free tier available.

# astrology ephemeris astronomy natal-chart human-design astrocartography mcp ai-tools

Overview Content Tools Comments

Overview

Open Ephemeris is a high-precision astrology API with an MCP server exposing 116+ endpoints across natal charts, transits, synastry, Human Design, BaZi, solar returns, and more.

Calculated using the JPL DE440 ephemeris. Supports Claude, ChatGPT, and Gemini CLI.

Features:

Natal chart positions, houses, and aspects
Transit forecasting and ingress tracking
Synastry and composite charts
Human Design bodygraph
BaZi four pillars
Moon phases, eclipses, retrograde cycles

Get an API key at openephemeris.com

Server Config

{
  "mcpServers": {
    "openephemeris": {
      "command": "npx",
      "args": [
        "-y",
        "@openephemeris/mcp-server"
      ],
      "env": {
        "OPENEPHEMERIS_API_KEY": "YOUR_API_KEY"
      }
    }
  }
}

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