Why don't I get an alert?

These calendars carry no alerts, so the events appear silently. For a reminder on the day, the Plenilune app’s full moon, new moon and quarter notifications are free.

Is it free? Do I need an account?

It is free, with nothing to sign up for. Your calendar app downloads a plain file from plenilune.app and reads it again from time to time.

Which time zone are the times in?

Yours. Each event is stored at its exact instant in Universal Time, and Calendar shows it in the time zone of the device. If you travel, the times follow you, unless Time Zone Override is on in Settings › Apps › Calendar.

Will the calendar update by itself?

Yes. The file always covers the past month and the next 24 months, and it asks to be read again once a day; iOS decides when it actually fetches it. Each event keeps the same identifier, so a refresh never duplicates anything.

Does it work with Google Calendar or Outlook?

Yes. The + Google button opens the subscription in Google Calendar on a computer. Google does not let you subscribe from its iPhone app. For Outlook and other apps, copy the address and add it as an internet calendar. Google decides how often it reads the file again, sometimes only once a day or less.

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Guides

Add moon phases to your iPhone calendar

The iPhone Calendar app has no moon phases built in. You add them by subscribing to a calendar: it is free, needs no account, and takes two taps from this page.

Facts checked October 2026

October 2026

SMTWTFS

3🌗 Last Quarter1:24 PM

10🌑 New Moon3:49 PM

18🌓 First Quarter4:12 PM

26🌕 Full Moon · Hunter’s Moon4:11 AM

Apple Calendar Google

Times are in Universal Time (UTC) until your time zone is detected. Events arrive without an alert; for a reminder on the day, the Plenilune app’s moon notifications are free. Download on the App Store

How to subscribe

On iPhone or Mac: tap + Apple Calendar under the calendar, tap Subscribe, then confirm on the next screen.
By hand on iPhone: copy the address, then Settings › Apps › Calendar › Calendar Accounts › Add Account › Other › Add Subscribed Calendar.
On a Mac: Calendar › File › New Calendar Subscription, paste the address, and choose iCloud so it reaches your iPhone.
To remove it: open Calendar, tap Calendars, tap the info button next to the calendar, then tap Unsubscribe.

Checked against Apple's documentation for iOS 27, on 2 October 2026.

What the calendar contains

Each event sits at the exact instant of the phase, so Calendar shows it at your local time: the Hunter’s Moon of 26 October 2026, at 04:11 UTC, appears at 04:11 in London and at 21:11 the evening before in Los Angeles. Full moons carry their traditional name, lunar eclipses and supermoons (under 360,000 km) are marked, and the file covers the past month and the next 24 months. The two addresses are https://www.plenilune.app/calendar/en/moon-phases.ics and https://www.plenilune.app/calendar/en/full-moons.ics.

I make Plenilune, a lunar almanac app for iPhone, and both calendars are computed with its algorithms (Jean Meeus, Astronomical Algorithms). The preview above comes from the same file you subscribe to.

Questions

Why don't I get an alert?: These calendars carry no alerts, so the events appear silently. For a reminder on the day, the Plenilune app’s full moon, new moon and quarter notifications are free.
Is it free? Do I need an account?: It is free, with nothing to sign up for. Your calendar app downloads a plain file from plenilune.app and reads it again from time to time.
Which time zone are the times in?: Yours. Each event is stored at its exact instant in Universal Time, and Calendar shows it in the time zone of the device. If you travel, the times follow you, unless Time Zone Override is on in Settings › Apps › Calendar.
Will the calendar update by itself?: Yes. The file always covers the past month and the next 24 months, and it asks to be read again once a day; iOS decides when it actually fetches it. Each event keeps the same identifier, so a refresh never duplicates anything.
Does it work with Google Calendar or Outlook?: Yes. The + Google button opens the subscription in Google Calendar on a computer. Google does not let you subscribe from its iPhone app. For Outlook and other apps, copy the address and add it as an internet calendar. Google decides how often it reads the file again, sometimes only once a day or less.