Open Ephemeris vs Sidereon

In-depth architectural comparison of the Open Ephemeris and Sidereon MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

Which MCP Server Should You Choose?

Choose Open Ephemeris when:

• You need dedicated capabilities in the Aerospace & Astrodynamics domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore Open Ephemeris Details

Choose Sidereon when:

• You need dedicated capabilities in the Aerospace & Astrodynamics domain.
• You prefer remote streaming HTTP/SSE transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore Sidereon Details

Feature & Specification Comparison

Specification	Open Ephemeris Aerospace & Astrodynamics	Sidereon Aerospace & Astrodynamics
Summary	Sub-arcsecond ephemeris and astrology on NASA JPL DE440: natal, transits, eclipses, Human Design.	GNSS positioning and astrodynamics: orbit propagation, passes, GNSS solves, and RINEX QC
Category & Scope	Aerospace & Astrodynamics	Aerospace & Astrodynamics

Tools & Capabilities Breakdown

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

{
  "mcpServers": {
    "open-ephemeris": {
      "command": "npx",
      "args": [
        "-y",
        "@smithery/cli"
      ]
    }
  }
}

{
  "mcpServers": {
    "sidereon": {
      "url": "https://img.shields.io/badge/DOI-10.5281%2Fzenodo.21174996-1682D4.svg)](https://doi.org/10.5281/zenodo.21174996"
    }
  }
}

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