hellocetus: supermoon calendar

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.