openephemeris/openephemeris-MCP

Overview

An MCP server and API examples for OpenEphemeris, a NASA JPL ephemeris API. It exposes ephemeris data to AI agents through the Model Context Protocol, with Python example code for common query patterns.

Best for

Best for
Developers building AI agents that need NASA JPL ephemeris data

Use cases

• Retrieve celestial body positions for AI agent tasks
• Expose NASA JPL ephemeris data through MCP-compatible tools
• Prototype agent workflows that consume astronomical time-series data

How to use

Install

npx -y @smithery/cli install @open-ephemeris/openephemeris --client claude

Tools exposed

• explore_natal_chart
• explore_bi_wheel
• explore_human_design
• explore_human_design_transit
• explore_human_design_connection
• explore_vedic_chart
• explore_bazi_chart
• explore_transit_timeline
• explore_moon_phase
• output_mode
• OPENEPHEMERIS_API_KEY
• ASTROMCP_API_KEY
• OPENEPHEMERIS_BACKEND_URL
• OPENEPHEMERIS_PROFILE
• OPENEPHEMERIS_TOOLS
• OPENEPHEMERIS_TELEMETRY
• OPENEPHEMERIS_SERVICE_KEY
• OPENEPHEMERIS_JWT
• OPENEPHEMERIS_DEV_ALLOWLIST_PATH
• MCP_USER_ID

Tested with

Claude Desktop, Cursor, Windsurf, ChatGPT

Notes

An MCP server and API examples for OpenEphemeris, a NASA JPL ephemeris API. It exposes ephemeris data to AI agents through the Model Context Protocol, with Python example code for common query patterns.

4 stars on GitHub. Last updated 2026-09-15. Licensed MIT.

Use cases

• Retrieve celestial body positions for AI agent tasks
• Expose NASA JPL ephemeris data through MCP-compatible tools
• Prototype agent workflows that consume astronomical time-series data

Pros

• Focused, minimal Python implementation
• Includes working API examples for quick integration
• Direct pathway from AI agents to NASA JPL ephemeris data

Cons

• Very few GitHub stars, indicating limited community traction
• Depends on network access to the NASA JPL API
• Niche scope limited to astronomical ephemeris queries

Indexed from awesome-mcp-servers-punkpeye and enriched against its public facts.