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

Tools

auth_login

auth_status

auth_logout

dev_call

dev_list_allowed

ephemeris_natal_chart

ephemeris_transits

ephemeris_moon_phase

ephemeris_next_lunar_phase

ephemeris_next_eclipse

human_design_chart

ephemeris_synastry

ephemeris_relocation

ephemeris_electional

electional_moment_analysis

electional_station_tracker

electional_aspect_search

vedic_chart

chinese_bazi

ephemeris_chart_wheel

ephemeris_bi_wheel

ephemeris_solar_return

ephemeris_lunar_return

ephemeris_planetary_return

ephemeris_progressed_chart

ephemeris_planet_position

ephemeris_house_cusps

ephemeris_composite

ephemeris_composite_midpoint

ephemeris_overlay

ephemeris_natal_transits

human_design_composite

human_design_penta

human_design_bodygraph

hd_planetary_return

hd_opposition

ephemeris_natal_batch

ephemeris_dignities

ephemeris_retrograde_status

ephemeris_midpoints

ephemeris_fixed_stars

ephemeris_hermetic_lots

ephemeris_angles_points

ephemeris_aspect_check

venus_star_points

venus_star_points_conjunctions

venus_eight_year_star

venus_phase

venus_elongations

venus_stations

acg_power_lines

acg_hits

Server Config

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

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