CycleCalcs Astronomy vs Ephemeris MCP

In-depth architectural comparison of the CycleCalcs Astronomy and Ephemeris MCP 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?

C

Choose CycleCalcs Astronomy 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 CycleCalcs Astronomy Details

Choose Ephemeris MCP 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).
• Primary tools included: get_planetary_positions.

Explore Ephemeris MCP Details

Feature & Specification Comparison

Specification	C CycleCalcs Astronomy Aerospace & Astrodynamics	Ephemeris MCP Aerospace & Astrodynamics
Summary	Astronomy: sun, moon, planet, eclipse, twilight and star position calculations.	Precision astronomical ephemeris and planetary positions via the Swiss Ephemeris.
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": {
    "cyclecalcs-astronomy": {
      "command": "npx",
      "args": [
        "-y",
        "cyclecalcs-astronomy"
      ]
    }
  }
}

{
  "mcpServers": {
    "ephemeris-mcp": {
      "command": "uvx",
      "args": [
        "ephemeris-mcp"
      ]
    }
  }
}

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