hellocetus: supermoon calendar
Moon Phases, Planets & Sky
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Plan the next supermoon, follow daily Moon phases and rise times, and compare planet positions from local, Earth, and Sun views.
hellocetus is an astronomy calendar for planning supermoons, following Moon phases, checking local Sun and Moon times, and comparing planet positions. Browse long-range events or open today’s sky data in one focused app.
Plan ahead with the supermoon calendar
• Browse long-range supermoon dates and astronomy events by year
• See exact local event times and countdowns for upcoming supermoons
• Explore Supermoons, Micromoons, Blue Moons, Black Moons, Harvest Moons, Hunter’s Moons, Blood Moons, Super New Moons, and Micro New Moons
• Find solar and lunar eclipse dates in the same event calendar
Follow the Moon day by day
• View a monthly calendar with each day’s Moon phase and illumination
• Open full moon details with the local event time, moonrise, moonset, city, time zone, and sky position
• Check today’s moonrise, moonset, phase, illumination, and lunar angle
• Save observation notes, plans, and reminders directly on calendar dates
• Receive optional alerts one hour before supported astronomy events
Compare planets and the sky
• Switch between Local Sky, Earth-centered, and Sun-centered planet views
• Compare altitude, azimuth, brightness, longitude, latitude, distance, right ascension, declination, and elongation
• Follow short-term planetary motion with timeline views
• Use a selected city or saved GPS location for local calculations
• Compare standout constellations above the horizon across countries and representative cities
• Explore planet surface previews in a clean globe-style interface
Daily Sun and Moon information
Check sunrise, sunset, total daylight, day-length change, moonrise, moonset, phase, and illumination at a glance. hellocetus brings long-range planning and everyday sky data into one focused experience.
Free and Premium
hellocetus includes advertising. Optional monthly, yearly, or lifetime Premium removes ads and unlocks the Home Screen full moon widget. Current products, localized prices, renewal details, and purchase terms are shown in the app before purchase.
Available in 22 supported languages.
Terms of Service:
https://hellocetus.com/terms/
Apple Standard Terms of Use (EULA):
https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The Full Moon widget has been added!
The developer, Waitcle, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Location
- Identifiers
- Usage Data
- Diagnostics
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Location
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Waitcle
- Size
- 80.7 MB
- Category
- Lifestyle
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 17 more
- English, Dutch, French, German, Hindi, Indonesian, Italian, Japanese, Korean, Polish, Portuguese, Russian, Simplified Chinese, Spanish, Thai, Traditional Chinese, Turkish, Vietnamese
- Age Rating
4+
- 4+
- Contains
Advertising
- In-App Purchases
Yes
- HelloCetus Premium Yearly $4.99
- HelloCetus Premium Monthly $1.99
- HelloCetus Premium $6.99
- Copyright
- © 2026 Waitcle