HELLO CETUS · iPHONE & ANDROID
Your next night out,
written in the stars.
Found the Moon tonight? Plan your next look. With Hello Cetus, keep notes on your lunar calendar and turn on reminders for upcoming astronomy events.
Free download · Contains ads and in-app purchases
Try today's Moon on the web →
From a quick lookup to a night you remember
An observing notebook on your calendar
Add a place, a plan, or a packing note to a date. Compare daily Moon phases and illumination as you plan your next outing.
A reminder before the event
Enable astronomy alerts in the app for a notification one hour before supported events. Delivery depends on your device permissions and notification settings.
Go beyond the Moon
Compare planets in Local Sky, Earth-centered, and Sun-centered views. Check Sun and Moon times using a selected city or your GPS location.
Before you download
Will my web selection appear in the app?
The buttons open the app stores. Your city and date are not transferred automatically; select them again inside the app.
Is the app free?
The app is free to download and includes advertising. Optional Premium removes ads and unlocks the full-Moon home-screen widget. See prices and purchase terms inside the app.
Does it notify me about every event?
Alerts cover supported astronomy events. Enable them in the app and allow notifications on your device. Power-saving and other device settings can affect delivery.
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