1.
autumnal equinox
The time in September when day and night are approximately equal in length, marking the midpoint of autumn.
A compound of 秋 (autumn) and 分 (division, equinox). Refers to the astronomical event when the sun crosses the celestial equator heading south.
Cultural note
秋分の日 (Autumnal Equinox Day) is a national holiday in Japan. It falls during 秋の彼岸 (the autumn equinox week), when people visit family graves, clean them, and offer おはぎ (rice balls coated in sweet bean paste).
Common collocations
- 秋分の日 — Autumnal Equinox Day (national holiday)
- 秋分点 — autumnal equinox point (astronomical term)