astronomy mcp server for Gemini CLI

io.github.cyanheads/astronomy-mcp-server

Offline observational astronomy: positions, rise/set, moon phases, eclipses, and seasons.

client:Gemini CLI transport:streamable-http runtime:npm tools:7

Install astronomy mcp server in Gemini CLI

~/.gemini/settings.json · windows: %USERPROFILE%\.gemini\settings.json

{
  "mcpServers": {
    "astronomy-mcp-server": {
      "httpUrl": "https://astronomy.caseyjhand.com/mcp"
    }
  }
}

Gemini expands $VAR and ${VAR} inside env values, so a secret can live in your shell rather than this file. Gemini CLI docs