What happened
Japan’s traditional harvest-moon night, Chushu no Meigetsu or Jugoya, fell on Friday, 25 September 2026. The astronomical full Moon occurred early on Sunday, 27 September in Japan, two calendar dates later.
The traditional occasion is the fifteenth day of the eighth month of the lunisolar calendar. The month starts with the new Moon, so this date does not always match the astronomical full Moon. On the 25th, the Moon already appeared close to round.
Another traditional occasion is Jusanya, the thirteenth-night Moon, also called Nochi no Tsuki. In 2026 it falls on Friday, 23 October.
Why it matters
- The difference is a useful reminder that the traditional fifteenth night is not always the astronomical full Moon.
- The nights of 26 September and early 27 September offered a rounder Moon after the traditional occasion.
- Including Jusanya extends the moon-viewing season into late October.
An editorial note
The small surprise of a harvest-moon celebration before the full Moon offers a way to explore the calendar. If you missed the September occasion, the next traditional moon-viewing date is 23 October. Dates in this article are Japanese local dates, and the September viewing window is now in the past.
Sources and dates
Original article: 2026-09-26. English edition prepared: 2026-10-01. Key official sources rechecked on that date. Details can change; consult the linked official pages.