hellocetus: supermoon calendar

Supermoon & moon phases

Only for iPhone

Free · Designed for iPhone. Not verified for macOS.

iPhone

hellocetus is a modern astronomy app built around a long-range supermoon calendar, a moon calendar, and clear daily sky data. Track upcoming supermoons, follow the lunar cycle, and explore planetary positions in one clean experience. Whether you want to check the next supermoon, browse full moon names, view today’s moonrise and moonset, or compare planetary positions from multiple perspectives, hellocetus helps you understand the sky without unnecessary complexity. With hellocetus, you can: • Browse a long-range supermoon calendar and astronomy calendar • Find upcoming supermoons with exact local event times and countdowns • Follow the complete lunar cycle in a monthly moon calendar with daily phase and illumination • Explore special Moon events including Supermoon, Micromoon, Blue Moon, Black Moon, Harvest Moon, Hunter's Moon, Blood Moon, Super New Moon, and Micro New Moon • See lunar eclipse and solar eclipse dates in the same event calendar • Open full moon detail views with local event time, moonrise, moonset, city, time zone, and sky position at the moment of full moon • Check today’s moonrise, moonset, illumination, moon phase, and lunar angle at a glance • Check today’s sunrise, sunset, total daylight time, and day-length change for your selected location • Save observation notes, plans, or reminders directly on calendar dates • Receive astronomy alerts one hour before supported astronomy events • Explore planetary data in Local Sky, Earth-centered, and Sun-centered views • Compare altitude, azimuth, brightness, longitude, latitude, distance, right ascension, declination, and elongation for each planet • Follow short-term planetary motion with timeline views • Use a selected city or a saved GPS location for local sky calculations • Compare standout constellations above the horizon across countries and representative cities • Browse planet surface previews in a clean globe-style interface • Use hellocetus in 22 supported languages Supermoon calendar first The supermoon calendar is one of the core experiences in hellocetus. Instead of burying supermoon dates inside a generic event list, hellocetus gives them a central place. You can browse long-range supermoon data, open exact event details, follow countdowns to the next supermoon, and see related full moon information in the same flow. Moon calendar and full moon tracking hellocetus makes everyday Moon tracking simple. Follow daily lunar phases, illumination, and special event markers in the moon calendar, then open individual dates for more detail. Full moon pages help you move from a broad calendar view to exact local timing, moonrise and moonset, and the sky position of the Moon at the key moment. Daily Sun and Moon information For everyday use, hellocetus gives you the essential data quickly: sunrise, sunset, total daylight time, day-length change, moonrise, moonset, phase, and illumination. This makes the app useful not only as a supermoon calendar but also as a practical daily sky companion. Planet positions without unnecessary complexity When you want to go beyond the Moon, hellocetus helps you explore planetary positions visually and numerically. Switch between Local Sky, Earth-centered, and Sun-centered views to understand where planets are in your sky, around Earth, or within the solar system. hellocetus turns complex astronomy into a clear everyday tool for supermoon planning, moon tracking, planet study, and sky exploration.

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Improved UI/UX and optimized app performance.

Version 1.0.11

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

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

Seller
  • Waitcle
Size
  • 158.1 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.
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+
Copyright
  • © 2026 Waitcle
  • Developer Website
  • Privacy Policy

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