Open Ephemeris MCP Server

by openephemeris Your server? Claim it

answering

Open Ephemeris is answering right now. Last checked 7 min ago. Last commit 15 Sep 2026.

Sub-arcsecond astrology on NASA JPL DE440: natal, transits, Human Design, Vedic, BaZi.

Uptime history 27 days of history

27 days agonow

100.0%

Uptime 24h

92 of 92 checks

—

Tools

hidden behind auth

396 ms

Response time

average over 24h

Stars

last commit 15 Sep 2026

Nothing serious here today

Today is the operative word: we check Open 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

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 7 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add open-ephemeris --transport http https://mcp.openephemeris.com/mcp

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

{
  "mcpServers": {
    "open-ephemeris": {
      "url": "https://mcp.openephemeris.com/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.open-ephemeris]
url = "https://mcp.openephemeris.com/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "open-ephemeris": {
      "url": "https://mcp.openephemeris.com/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "open-ephemeris": {
      "url": "https://mcp.openephemeris.com/mcp"
    }
  }
}

This endpoint answered with an authorization challenge. The server is running, and it signs you in through your browser: there is no API key to paste.

Endpoints

URL	Transport	State	Latency	Checked
https://mcp.openephemeris.com/mcp	streamable-http	sign-in	432 ms	7 min ago

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Open Ephemeris — questions

Answers built from our own checks of this server.

Why is there no tool list for Open Ephemeris?

The server answered our handshake with an authorization challenge, so it is running — but it will not describe its tools to an anonymous client. To see them you need to connect with your own credentials. We record it as alive, not as broken: 100.0% of checks in the last 24 hours got a reply.

Is Open Ephemeris working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 396 ms. The bar chart above shows every period we have measured.

How do I connect Open Ephemeris?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address. You sign in through your browser once and the client keeps the session: no key to copy, and it refuses anonymous clients.

How do you sign in to Open Ephemeris?

No API key is involved. Open Ephemeris answers our knock with an OAuth challenge, so you authorise it once in your browser and the client keeps the session. That is also why we see no tool list: it will not describe itself to an anonymous client, and that is the server working as intended, not a fault.

How fast is Open Ephemeris?

It answers our handshake in 396 ms on average, which is faster than 38% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is Open Ephemeris open source?

Yes — it is published under the MIT licence, written in Python and 4 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.