How to put the moon phases inside Google Calendar, Outlook or iCloud

Updated August 2026 · the Calen1 team

In short: Subscribe to Calen1's moon calendar (a $5 MXN per month add-on) in Google Calendar, Outlook or iCloud and every day shows the moon phase with its symbol, right next to your meetings, without opening another app.

If you follow the moon — for fishing, planting, haircuts, photography, or simply because you like knowing where it is — you probably check it in a separate app today. One thing to see the moon, another to see your day. And because the moon is not where you already look every morning, you miss it.

This is how to put the moon phase inside the calendar you already use, so it sits next to your meetings without getting in the way, and what the two ways of doing it are good for.

A moon app versus a moon calendar

A moon app makes you go find it. A moon calendar does the opposite: it sits in the calendar you open every day, and the information finds you.

Technically it is a calendar subscription: a web address your provider downloads on its own every few hours and draws as one more calendar. It is not an app you install, and not a permission you hand anyone over your data. It is read-only, so it cannot touch, move or delete anything of yours.

In practice that means you can hide it with a checkbox whenever you don't want to see it, and it is still there when you switch it back on.

Four notes a month, or a small moon every day

There are two ways to bring the moon into your agenda, and they are good for different things.

Just the four phases. One event on the new moon, one on the first quarter, one on the full moon and one on the last quarter, with the exact time in the description. It is discreet: four lines a month. Useful when what matters is the precise moment: a tide, a planting, a night shot.

A small moon every day. Every day of the month carries its symbol and how lit it is: 🌑 0%, 🌓 50%, 🌕 100%. Open the month and you see the whole cycle at a glance, like an almanac. This is the one that looks right on a phone, and the one most people mean when they say «I want the moon calendar».

Calen1 has both, and they can be subscribed at the same time without clashing.

How to subscribe, per calendar

The steps are the same everywhere: copy the address and paste it into the «subscribe from URL» option. Never paste that address into the browser's address bar expecting something to happen: it is not a page, it is a file your calendar downloads.

Google Calendar (on a computer): in the left sidebar, next to Other calendars, click + → From URL → paste the address → Add calendar. It takes a few minutes the first time, and once added it shows up on your phone too.

Outlook / Microsoft 365: Add calendar → Subscribe from web → paste the address, give it a name and a colour → Import.

Apple iCloud: on a Mac, Calendar → File → New Calendar Subscription. On iPhone: Settings → Apps → Calendar → Accounts → Add Account → Other → Add Subscribed Calendar.

One detail that confuses many people: subscribed calendars refresh when the provider decides to, usually every few hours. If you just subscribed and see nothing, it is not broken: give it time.

Why it never blocks your availability

A common flaw in the moon calendars floating around is that their events are marked as busy. If you share your availability or use a booking page, the moon then blocks entire days and nobody can book you.

Calen1's feeds are marked free on purpose. They show up in your calendar, but for availability they do not exist: they never fill a slot, never show you as busy to whoever looks at your agenda, and never affect the booking page in the Pro plan.

Where the dates come from

The phases are not taken from a table copied off the internet, nor from a «29 and a half days» count. They are computed with Meeus's algorithm, the astronomical standard, which corrects the real variations of the orbit: the gap between two new moons ranges from 29.27 to 29.83 days, so an average drifts within a few years.

The checking is the part that matters: the calculation is tested against documented eclipses. A solar eclipse can only happen on a new moon and a lunar one only on a full moon, so they are a hard, objective test. The 21 August 2017 and 8 April 2024 solar eclipses land on a new moon at 0% illumination; the 21 January 2019 and 31 January 2018 lunar ones, on a full moon. If one of those ever failed, the fix would be to find the error, not to loosen the test.

Dates are shown in central Mexico time, and the exact time of each phase goes in the event description, in local time and in UTC.

What it costs and how to turn it on

The moon calendar is a $5 MXN a month add-on on top of any Calen1 plan (Base $50 or Pro $149 a month, billed in Mexican pesos). You turn it on from your dashboard with one button, and both addresses appear right there: the daily one and the four-phase one.

Every customer gets their own signed address. That means two things: it cannot be passed around as a public link, and if you cancel the add-on the calendar stops updating right away, with nobody having to do anything else.

And the honest part: this is a nice extra, not the reason to hire Calen1. What the product solves is your work and personal calendars being separate. The moon is what you put on top once that already works.