What is the key difference between Open Ephemeris and CycleCalcs Astronomy?

Open Ephemeris belongs to the Aerospace & Astrodynamics category with local stdio execution, while CycleCalcs Astronomy belongs to the Aerospace & Astrodynamics category with cloud HTTP/SSE execution.

How do I install Open Ephemeris or CycleCalcs Astronomy in Claude Desktop or Cursor?

Copy the mcpServers JSON configuration snippet provided on this page into your claude_desktop_config.json or ~/.cursor/mcp.json file and restart your AI client.

Are Open Ephemeris and CycleCalcs Astronomy free or paid?

Open Ephemeris operates under a Free / Open Source model (No auth required). CycleCalcs Astronomy operates under a Free / Open Source model (No auth required).

Which MCP server has more tools and community activity?

Open Ephemeris lists 0 tools with 0 views and 3 GitHub stars. CycleCalcs Astronomy lists 0 tools with 2 views and 0 GitHub stars.

Can I use both Open Ephemeris and CycleCalcs Astronomy together in the same MCP host?

Yes! MCP hosts like Claude Desktop, Cursor, Windsurf, Cline, and VS Code support configuring multiple servers under the mcpServers object simultaneously.

Side-by-Side Model Context Protocol Comparison

Open Ephemeris vs CycleCalcs Astronomy

In-depth architectural comparison of the Open Ephemeris and CycleCalcs Astronomy 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.

At a Glance & Executive Verdict

Open Ephemeris

Aerospace & Astrodynamics · Local stdio

Quality: 41/100 (Fair) | Auth: No auth required

CycleCalcs Astronomy

Aerospace & Astrodynamics · Remote HTTP/SSE

Quality: 41/100 (Fair) | Auth: No auth required

Verdict Summary: Choose Open Ephemeris if you need specialized Aerospace & Astrodynamics tools running via a local process. Choose CycleCalcs Astronomy if your workspace requires Aerospace & Astrodynamics integration with remote web transport. Both servers can be configured concurrently in your client's mcpServers manifest.

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 CycleCalcs Astronomy 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 CycleCalcs Astronomy Details

Feature & Specification Comparison

Specification	O Open Ephemeris Aerospace & Astrodynamics	C CycleCalcs Astronomy Aerospace & Astrodynamics
Summary	Sub-arcsecond ephemeris and astrology on NASA JPL DE440: natal, transits, eclipses, Human Design.	Astronomy: sun, moon, planet, eclipse, twilight and star position calculations.
Category & Scope	Aerospace & Astrodynamics	Aerospace & Astrodynamics

Tools & Capabilities Breakdown

Open Ephemeris Tools (0)

No explicit tool names declared in metadata yet. Check project README on main listing page.

CycleCalcs Astronomy Tools (0)

No explicit tool names declared in metadata yet. Check project README on main listing page.

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).

Open Ephemeris Configuration

mcpServers (Claude Desktop / Cursor)

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

CycleCalcs Astronomy Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "cyclecalcs-astronomy": {
      "url": "https://www.cyclecalcs.com/api/mcp.html"
    }
  }
}

Frequently Asked Questions

Open Ephemeris is categorized under Aerospace & Astrodynamics and uses a local stdio subprocess. In contrast, CycleCalcs Astronomy belongs to Aerospace & Astrodynamics using remote streaming HTTP/SSE transport. Select Open Ephemeris when you need capabilities focused on aerospace & astrodynamics and CycleCalcs Astronomy when you require tools for aerospace & astrodynamics.

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