MCP Server

Celestine Astrology.

Birth charts, transits, progressions, aspect grids, iCal export. NASA-validated calculations.

GitHub

Data sources

What it connects to

Pulls live data from:

Swiss Ephemeris (NASA-validated planetary data)

Pricing

Free to connect. Pro to export.

All calculation tools are free. The personalised calendar export is Celestine Pro — £6/month.

Free

£0

Natal birth chart (planets, houses, aspects)
Current transits and transit search
Planetary positions for any date
Progression report (secondary + solar arc)
Sign, house, and aspect lookups

Celestine Pro

£6/month

Personalised astrological calendar — 330+ events
iCal export — syncs to Google, Apple, Outlook
Moon phases, sabbats, retrogrades, transits & progressions

API key emailed after checkout.

Get connected

Takes about 30 seconds

Pick the app you use. Paste one URL. That's it.

claude.ai

Go to Settings (bottom left)
Click MCP Servers
Click Add
Paste this URL:
https://celestine-mcp.fly.dev/mcp

Claude Desktop

Open your config file:

Mac: ~/Library/Application Support/Claude/claude_desktop_config.json
Windows: %APPDATA%\Claude\claude_desktop_config.json

Add to the mcpServers section:

{
  "mcpServers": {
    "celestine": {
      "type": "http",
      "url": "https://celestine-mcp.fly.dev/mcp",
      "env": {
        "CELESTINE_API_KEY": "cel_..."
      }
    }
  }
}

Omit the env block if you haven't subscribed — free tools still work.

Claude Code

Run this in your terminal:

claude mcp add --transport http celestine https://celestine-mcp.fly.dev/mcp

To enable calendar export, set your API key: CELESTINE_API_KEY=cel_... in your MCP server environment config.

ChatGPT

Go to Settings
Click Connected apps
Click Add MCP server
Paste this URL:
https://celestine-mcp.fly.dev/mcp

Cursor / other editors

Add to your .cursor/mcp.json or equivalent config:

{
  "mcpServers": {
    "celestine": {
      "url": "https://celestine-mcp.fly.dev/mcp"
    }
  }
}

Free tools need no key. Add CELESTINE_API_KEY from your Pro subscription to unlock calendar export.

Need this connected to your own systems?

The server covers public registers. If you need it wired into your own data, internal tools, or a workflow built around your team, that's what we do.

Book a free call

Open source

Free to use, fork, and build on. Pull requests welcome.