hellocetus: supermoon calendar
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| Rating | |||
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| South Korea | 50%2 | 5.00 | |
| Japan | 25%1 | 5.00 | |
| Vietnam | 25%1 | 5.00 | |
| United Arab Emirates | <1%0 | — | |
| Afghanistan | <1%0 | — | |
| Antigua And Barbuda | <1%0 | — | |
| Anguilla | <1%0 | — | |
| Albania | <1%0 | — | |
| Armenia | <1%0 | — | |
| Angola | <1%0 | — |
Description
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/