MCP Ephemeris MCP Server

by kairosastro-sketch Your server? Claim it

local only

MCP Ephemeris runs on your own machine — the client starts it, so there is no endpoint to ping. 60 installs a week from npm. Last commit 21 Jul 2026.

NASA-validated computed planetary positions for your AI: 19 astrology tools, never hallucinated.

Installs per day peak 19 · avg 5 · +94% w/w

a month agotoday

Installs / week

npm · @cosmosos/mcp-ephemeris

Stars

0 open issues

21 Jul 2026

Last commit

no releases in 90 days

PolyForm-Noncommercial-1.0.0

License

TypeScript

Nothing serious here today

Today is the operative word: we check MCP Ephemeris every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add mcp-ephemeris -- npx -y @cosmosos/mcp-ephemeris

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "mcp-ephemeris": {
      "command": "npx",
      "args": [
        "-y",
        "@cosmosos/mcp-ephemeris"
      ]
    }
  }
}

~/.codex/config.toml

[mcp_servers.mcp-ephemeris]
command = "npx"
args = ["-y", "@cosmosos/mcp-ephemeris"]

.cursor/mcp.json

{
  "mcpServers": {
    "mcp-ephemeris": {
      "command": "npx",
      "args": [
        "-y",
        "@cosmosos/mcp-ephemeris"
      ]
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "mcp-ephemeris": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@cosmosos/mcp-ephemeris"
      ]
    }
  }
}

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MCP Ephemeris — questions

Answers built from our own checks of this server.

Why is there no uptime for MCP Ephemeris?

MCP Ephemeris runs on your own machine over stdio — there is no network address to reach, so uptime cannot be measured for it by anyone. What can be measured is adoption: the npm package @cosmosos/mcp-ephemeris was installed 60 times last week.

How do I connect MCP Ephemeris?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It runs locally, so the command pulls @cosmosos/mcp-ephemeris straight from npm; nothing to host, nothing to sign up for.

How many people use MCP Ephemeris?

The npm package @cosmosos/mcp-ephemeris was installed 60 times in the last week. Week over week that is +94%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.

Is MCP Ephemeris open source?

No, and the distinction matters: its licence is declared as PolyForm-Noncommercial-1.0.0. That makes it source-available — you can read the code, but the terms are the author's own, not one of the recognised open-source licences. Read them before you build on it.