Tonight's moon has a name.
Every night, the moon has a name.
In old Japan, people did not just watch the moon wax and wane — they honoured each night of its journey with a name. The full moon is Mangetsu. The night after, the moon hesitates to rise, so it is called Izayoi, "the hesitant moon". Then come Tachimachi ("stand and wait"), Imachi ("sit and wait"), Nemachi ("lie down and wait") — names that trace how, night by night, the moonrise comes later and people waited longer.
Tsukigoyomi brings this poetic lunar tradition to your pocket, together with a precise moon-age calendar.
TODAY'S MOON
- A beautifully drawn moon disc showing tonight's exact phase
- Moon age, lunar day and illumination percentage
- Tonight's traditional Japanese name with reading and meaning
- Countdown to the next full moon and new moon
- Traditional tide name (Ōshio, Koshio…) derived from the lunar day — handy for anglers
MOON CALENDAR
- A month view with a mini moon for every single day
- Find full moons, new moons and named nights at a glance
- Tap any date to see its moon, name and tide
MOON NAME GUIDE
- All the traditional names from Shingetsu (new moon) to Misoka-zuki
- Readings, romaji and the story behind each name
Tsukigoyomi works completely offline, collects no data, and needs no permissions. Just open it and meet tonight's moon.
Open the app and tonight's moon is right there, drawn with astronomical accuracy. See the moon age, lunar calendar date, and illumination at a glance, with a live countdown to the next full and new moon.
Izayoi, the hesitating moon. Tachimachi-zuki, the moon you stand and wait for. Every day brings one of 17 traditional Japanese moon names, presented as a card with its reading and the story behind it.
A whole month of moonlight at a glance. Every single day shows a miniature moon icon, so you can spot the next full moon, plan a moon-viewing evening, or trace the lunar cycle across the weeks.
A pocket compendium of all 17 traditional moon names, from the new moon to the last sliver of the month. Browse each name's reading, meaning, and origin — a small field guide to a thousand years of moon-gazing culture.
Spring tide, neap tide, and the traditional Japanese tide names in between — shown every day, in step with the moon age. A handy companion for fishing trips, beachcombing, and anyone who lives by the sea.
Zero permissions, zero tracking, zero network requests. No location access, no account, no ads. Everything is calculated on your device, so it works on a mountaintop in airplane mode. One-time purchase, nothing more.