Ask your assistant about the light.

Nine tools.

• sun_timesSunrise, sunset, solar noon, day length, the bearings, golden and blue hour, for any date.
• light_nowDaylight, golden hour, blue hour or night this minute, and what comes next.
• sunset_callTonight’s sunset in one of four words, with the reasons, from a live forecast.
• sunset_outingThe whole evening as one plan: when to arrive, which way to look, golden hour to last light, and a link to send.
• sun_on_windowHours of direct sun by the way a window faces, today, at midsummer and at midwinter.
• room_sunlightThe room behind the window: how much of the floor the sun covers, and how deep it reaches.
• compare_placesOne instant in two to twelve places, and the hours when the sun is up in all of them.
• moon_tonightPhase, how much is lit, where it stands, moonrise and moonset, and the next full moon.
• shadow_lengthThe length and direction of a shadow at a given time, and when it equals the height.

Install.

Claude Desktop, Claude Code, Cursor and anything else 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 · its version and checksum. It will be on npm as sol-light-mcp; the arguments then 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.

A place is any city name or a pair of coordinates with a time zone. Sol’s own cities answer at once in their own zone; any other name is found through Open-Meteo’s geocoder. Times come back both as instants and as local clock times.

The sunset forecast reads live weather from Open-Meteo and judges it by the same method as this site. Nothing else leaves your machine.