Zassetsu Calendar (Doyō, Higan, Nyūbai)
Pick a year to list setsubun, hachijūhachiya, nyūbai, hangeshō, doyō, the ox days of summer doyō, higan and shanichi. Same astronomical engine as the 24 solar terms, with a baked lookup for this year and next.
| Marker | Date |
|---|
Zassetsu dates in 2026 and 2027
Zassetsu are seasonal markers placed between the 24 solar terms. Setsubun is the day before Risshun; hachijūhachiya and nihyakutōka count from Risshun; nyūbai, hangeshō and doyō follow solar longitude (nyūbai is not the JMA rainy-season start); higan is three days either side of the equinox; shanichi is the nearest Elder Earth stem day (a tie uses morning → earlier, afternoon → later). Below are 2026 and 2027.
2026
| Marker | Date |
|---|---|
| Setsubun | Feb 3 (Tue) |
| Risshun | Feb 4 (Wed) |
| Hachijūhachiya | May 2 (Sat) |
| Nyūbai | Jun 11 (Thu) |
| Hangeshō | Jul 2 (Thu) |
| Spring higan | Mar 17 (Tue) – Mar 23 (Mon) |
| Spring shanichi | Mar 25 (Wed) |
| Spring doyō | Apr 17 (Fri) – May 4 (Mon) |
| Summer doyō | Jul 20 (Mon) – Aug 6 (Thu) |
| Ox day(s) of summer doyō | Jul 26 (Sun) |
| Nihyakutōka | Sep 1 (Tue) |
| Nihyakuhatsuka | Sep 11 (Fri) |
| Autumn higan | Sep 20 (Sun) – Sep 26 (Sat) |
| Autumn shanichi | Sep 21 (Mon) |
| Autumn doyō | Oct 20 (Tue) – Nov 6 (Fri) |
| Winter doyō | Jan 17 (Sat) – Feb 3 (Tue) |
2027
| Marker | Date |
|---|---|
| Setsubun | Feb 3 (Wed) |
| Risshun | Feb 4 (Thu) |
| Hachijūhachiya | May 2 (Sun) |
| Nyūbai | Jun 11 (Fri) |
| Hangeshō | Jul 2 (Fri) |
| Spring higan | Mar 18 (Thu) – Mar 24 (Wed) |
| Spring shanichi | Mar 20 (Sat) |
| Spring doyō | Apr 17 (Sat) – May 5 (Wed) |
| Summer doyō | Jul 20 (Tue) – Aug 7 (Sat) |
| Ox day(s) of summer doyō | Jul 21 (Wed), Aug 2 (Mon) |
| Nihyakutōka | Sep 1 (Wed) |
| Nihyakuhatsuka | Sep 11 (Sat) |
| Autumn higan | Sep 20 (Mon) – Sep 26 (Sun) |
| Autumn shanichi | Sep 26 (Sun) |
| Autumn doyō | Oct 21 (Thu) – Nov 7 (Sun) |
| Winter doyō | Jan 17 (Sun) – Feb 3 (Wed) |
How to use
Pick a year to list zassetsu — seasonal markers between the 24 solar terms. The static table below is this year and next, baked at build time.
Example (2026)
- Setsubun — 3 Feb (the day before Risshun on 4 Feb)
- Hachijūhachiya — 2 May
- Nyūbai — 11 Jun (solar longitude 80°; not the JMA rainy-season start), hangeshō — 2 Jul
- Ox day of summer doyō — 26 Jul (one day)
- Spring higan — 17–23 Mar (midpoint is the equinox on 20 Mar)
- Spring shanichi — 25 Mar (the equinox is at night; the two Elder Earth days 15 and 25 Mar are equally far, so afternoon takes the later day)
Related tools
24 solar terms: nijūshi sekki. Rokuyo: rokuyo calendar. The ox-day list for this year and next is in the table below.