For assistants · MCP server
Ask your assistant about the light.
Sol's instruments as tools any assistant can call — the same mathematics this site computes, for any place on Earth, running on your own machine. No account, no key, no telemetry.
Install
Claude Desktop, Claude Code, Cursor, and anything that speaks MCP over stdio. Node 20 or newer.
{ "mcpServers": { "sol-light": {
"command": "npx",
"args": ["-y", "--package=https://solocene.com/mcp/sol-light-mcp.tgz", "sol-light-mcp"]
} } }
Claude Code, in one line:
claude mcp add sol-light -- npx -y --package=https://solocene.com/mcp/sol-light-mcp.tgz sol-light-mcp
The package: sol-light-mcp.tgz · version and checksum · source. On npm as sol-light-mcp soon; then the arguments become ["-y", "sol-light-mcp"].
Then ask
- Is it golden hour in Lisbon right now?
- Will the sunset be worth watching in Chicago tonight?
- How much sun does a south-facing window get in Oslo in December?
- How long is my shadow in Tokyo at 4 pm?
- When is the next full moon in Sydney?
- Where does the sun set in Reykjavik on the solstice?
How it answers
Places: any city name — Sol's own 88 answer instantly in their own zone, others are geocoded by Open-Meteo — or coordinates with a time zone. Times come back as instants and as local clock times. The sunset call uses a live Open-Meteo forecast, evaluated by the same method as the site. Nothing else leaves your machine.