Moon Calendar is listed as active in the registry but did not answer our last check. It exposes 8 tools. Last commit 7 Nov 2026.
Moon phases, full and new Moon dates, UK moonrise, eclipses, dark skies, tides and Moon sign.
Uptime history
20 hours of history · worst hour 0%
20 hours agonow
58.3%
Uptime 24h
42 of 72 checks
8
Tools
read from the server
374 ms
Response time
average over 24h
0
Stars
last commit 7 Nov 2026
Moon Calendar does not always answer
Over the last week it answered 58.3% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.
Connect this server
Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 5 min ago.
run in your terminal
claude mcp add mooncalendar-co-uk --transport http https://mooncalendar.co.uk/api/mcpSettings → Connectors → Add custom connector, then paste this address
https://mooncalendar.co.uk/api/mcp~/.codex/config.toml
[mcp_servers.mooncalendar-co-uk]
url = "https://mooncalendar.co.uk/api/mcp".cursor/mcp.json
{
"mcpServers": {
"mooncalendar-co-uk": {
"url": "https://mooncalendar.co.uk/api/mcp"
}
}
}.vscode/mcp.json
{
"servers": {
"mooncalendar-co-uk": {
"type": "http",
"url": "https://mooncalendar.co.uk/api/mcp"
}
}
}Available tools 8
Read directly from the server with tools/list, grouped by what they act on.
If a tool disappears, we record the date.
moon
find_moon_events
Returns the dates and UK times of upcoming full, new, first quarter and last quarter Moons, with each full Moon's traditional name, its distance, and supermoon, blue Moon, micromoon and black Moon flags. Special Moons can be listed on their own.
get_moon
Returns the Moon's phase, percent lit, lunar age, distance from Earth and waxing or waning direction right now, at 12:00 UK time on a date, or at a UK clock time on a date. Also returns whether it is a full Moon, the next full and new Moon, and at a UK place that date's moonrise, highest point and moonset, the Moon's height and compass bearing, and whether it is above the horizon after dark. Times are UK time, GMT or BST.
get_moon_calendar
Returns every day of one UK calendar month with its Moon phase and percent lit at 12:00 UK time, plus the exact UK times of that month's new, first quarter, full and last quarter Moons.
get_moon_sign
Returns the Moon's zodiac sign right now, on a UK date or at a UK date and time, tropical or Lahiri sidereal, with the degree into the sign, the next sign change and the website's one-line meaning of the sign. With a date alone it returns every sign the Moon is in that day.
crescent
check_crescent_visibility
Returns the first three evenings after a new Moon with a crescent sighting verdict (likely, difficult or not visible) for each of 24 UK places, with sunset, moonset, Moon age, height and best viewing time. It covers the latest new Moon until its third evening is over, then the next one.
eclipses
list_eclipses
Returns upcoming solar and lunar eclipses in date order with the UK peak time, the kind of eclipse and what the UK sees of it, including London contact times, coverage or totality where the Sun or Moon is above the horizon. With a place, each eclipse also shows that place's start, maximum and end, the share of the Sun covered or the Moon's height.
plan
plan_dark_skies
Returns the nights of one UK month with a dark-sky window, when the Sun is more than 18° below the horizon and the Moon is down, at one of 24 UK places, with each night's window times, hours and Moon phase. For photography it returns each night's Moon window, when the Moon is at least 5° up while the Sun is more than 6° below the horizon. Times are UK time, GMT or BST.
tides
get_tides
Returns the dates and UK times of spring tides (new and full Moons) and neap tides (first and last quarter Moons) from the Moon's phases, in date order, with the next spring tide and next neap tide first and perigean spring tides flagged. These are tide dates, not times or heights for a port.
Endpoints
| URL | Transport | State | Latency | Checked |
|---|---|---|---|---|
| https://mooncalendar.co.uk/api/mcp | streamable-http | answering | 75 ms | 5 min ago |
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Next solar eclipse, eclipse times by place, Moon phases and seasons from the US Naval Observatory.
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Official US economic release dates and times (GDP, PCE inflation, trade) in your time zone
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Sunrise, sunset, day length, golden hour, moon times and phases for Poland and anywhere.
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Sun rise and set, moon phases, twilight times and the seasons from the US Naval Observatory.
B
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NYSE, Federal Reserve, TARGET2 and UK business days, holidays and T+N settlement dates.
Moon Calendar — questions
Answers built from our own checks of this server.
What can Moon Calendar do?
It exposes 8 tools, read directly from the server on our last check. Among them: check_crescent_visibility, find_moon_events, get_moon, get_moon_calendar, get_moon_sign, get_tides and 2 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README.
How MCP servers expose tools in the first place →
Is Moon Calendar working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 42 of 72 checks got a reply (58.3%), average response time 374 ms. The bar chart above shows every period we have measured.
The registry lists Moon Calendar as active — why does it not respond?
The official MCP registry stores what the author submitted; it does not verify that the server still runs. We check the endpoint ourselves, and this one does not answer. Catalogues that copy the registry without checking will show it as working.
How do I connect Moon Calendar?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Moon Calendar need an API key?
No. Moon Calendar completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 8 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is Moon Calendar?
It answers our handshake in 374 ms on average, which is faster than 35% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.
Is Moon Calendar open source?
The code is open source: it is published under the MIT licence and 0 stars on GitHub. The licence covers the code in the repository, not the hosted service at mooncalendar.co.uk, which runs on its operator's own terms.