Słońce
Sunrise, sunset, golden hour and moon times for any place, with a Polish city lookup.
Connects to slonce.info.pl for sunrise, sunset, twilight, golden and blue hours, day length, moonrise, moonset and moon phases. Muse can get times for 258 Polish places or any coordinates, build a printable monthly sun calendar, and check clock changes and solstices.
Try asking Muse: "What time is sunset in Kraków today, and when is the next full moon?"
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Source: Found in the official MCP Registry (pl.info.slonce/slonce) · First listed November 5, 2026
Last 24 hours
Each bar is one check, every 15 minutes. Green means it answered. Last checked 4 h ago.
Is it safe to connect?
What Muse can see: It does not ask you to sign in, so it cannot see your accounts. It only sees what Muse sends it from your request.
Before it acts: Read what Muse plans to do before you approve it, and remove the app from Muse when you stop using it.
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How to add it to Muse
Not in Muse's Connectors list yet, but Muse can still use it. Copy the request below and paste it into Muse. Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
https://slonce.info.pl/mcpNot in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
Also use it in ChatGPT or Claude
Słońce is a remote MCP server, so any assistant that can add a custom connector by link can use it. Same link, same tools.
Add it to ChatGPT
- 1
Open ChatGPT settings
In ChatGPT, open Settings, then Connectors (called Apps & Connectors on some accounts).
- 2
Turn on developer mode
Under Advanced settings, switch on Developer mode. That is what lets you add a connector by link.
- 3
Create the connector
Choose Create, give it a name, paste the link as the MCP server URL, and save. If it needs a sign-in, ChatGPT asks for it here.
- 4
Use it in a chat
Start a chat, open the tools menu, pick the connector, and ask. ChatGPT asks before it runs a tool the first time.
Custom connectors need a paid ChatGPT plan, and on Team, Enterprise and Edu accounts only an admin can add them. Our "Working" label means the server answered us; it cannot tell whether your plan lets you add it. All connectors that work in ChatGPT
Add it to Claude
- 1
Open Claude settings
In Claude, open Settings, then Connectors.
- 2
Add a custom connector
Choose Add custom connector, give it a name, and paste the link.
- 3
Connect and use it
If it needs a sign-in, Claude sends you to it. Then turn the connector on in a chat from the tools menu and ask.
Custom connectors are available on paid Claude plans; on Team and Enterprise accounts an admin may need to add them. Our "Working" label means the server answered us; it cannot tell whether your plan lets you add it. All connectors that work in Claude
https://slonce.info.pl/mcpWhat people ask Muse to do
Technical details: safety screening, tools, response time and recent checks
Response time at the last check: 389ms. Worked in 100% of checks over 30 days.
Screening · November 5, 2026
Screened, no issues found
Screening looks for known threats and hidden instructions at the time of the check, and runs again weekly and whenever the tool list changes. It cannot see the server's code, so only connect what you need and review what Muse asks to do. How screening works.
Tools · 7
sun_timesSunrise, sunset, solar noon and day length at a place on a day (today by default), with how much longer or shorter the day is than the day before, civil, nautical and astronomical twilight, and the golden and blue hours for photos. Local clock time, to the minute.sun_calendarSunrise, sunset and day length for every day of a month at a place, with the change of the day length from day to day; the link opens the same calendar to print on one A4 page.moon_timesMoonrise and moonset at a place on a day (today by default), the moon's phase and lit part, a new or full moon or quarter that day, and the next new and full moon.moon_phasesThe new moons, first quarters, full moons and last quarters between two dates (two years at most; from today for 60 days by default), to the minute in a time zone (Polish time by default).clock_changeWhen the clocks change in Poland in a year (this year by default): the dates, which way and at what time, and the next change from today.solsticeThe December and June solstices of a year (this year by default) to the minute, Polish time; with a place, also its shortest and longest day, the earliest sunset and the latest sunrise of the winter.find_cityThe site's places whose name starts with the text (Polish or English names, with or without Polish letters): 258 places (Polish cities, places for trips and a few cities abroad), with coordinates, time zone and page.Recent checks
Link
https://slonce.info.pl/mcpQuestions about Słońce in Muse
How do I connect Słońce to Muse?
Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use Słońce to help me. It is a free service with an MCP server at https://slonce.info.pl/mcp. It does not need an API key. Ask me before you share anything with it." Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
Is Słońce working right now?
At the last check (November 7, 2026, 00:30 UTC) the endpoint was working, answering in 389ms. Over the last 7 days it answered 100% of health checks. It is checked every 15 minutes.
Is Słońce safe to connect to Muse?
It was screened on November 5, 2026 with the result "screened, no issues found". Screening checks the domain against threat feeds and reads the tools for hidden instructions and requests for passwords or card numbers. It cannot see the server's code, so grant only the access you need.
What can Słońce do in Muse?
It exposes 7 tools, including sun_times, sun_calendar, moon_times, moon_phases. For example, you could ask Muse: "What time is sunset in Kraków today, and when is the next full moon?"
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This listing was added from public sources (Found in the official MCP Registry (pl.info.slonce/slonce)). If you build Słońce, claim it to correct the details and get your badge.
Paste this on your site or README. It always shows the latest check.
<a href="https://musedirectory.ai/connector/s-on-ce"><img src="https://musedirectory.ai/badge/s-on-ce.svg" alt="Słońce on musedirectory.ai" width="236" height="40"></a>