Moon software and offline app
Install Moon Phase Software on a supported phone or desktop and keep an offline phase calculator and observation journal.
Offline phase calculator
46.8% illuminated · waxing at 2026-10-18 07:47 UTC.
Fullscreen Moon display
Keep a live Moon view open during an observing session. Exit fullscreen with Escape.
46.8% illuminated · 2026-10-18 07:47 UTC
Install Moon Phase Software
| Platform | Installation | Available tasks |
|---|---|---|
| Windows | Chrome or Edge: Install app | Offline phase, journal, fullscreen view |
| macOS | Chrome/Edge install; Safari Add to Dock when offered | Offline phase and journal |
| Linux | Chrome/Edge Install app | Offline phase, journal, fullscreen view |
| Android | Chrome menu: Install app | Offline phase and journal |
| iPhone/iPad | Safari Share: Add to Home Screen | Offline phase and journal |
On iPhone or iPad, open this page in Safari, choose Share, then Add to Home Screen. In Android Chrome, use the menu’s Install app or Add to Home screen. Desktop Chrome and Edge show an install icon when installation is available.
The installed page includes a phase calculator and an observation journal kept on this device. Enter UTC when using its offline calculator. Online calendars and city schedules remain accessible from the navigation. For calendar reminders, import the phase calendar feed and set alerts in your calendar app.