Japanese AlmanacSenbu days
Last updated:
| Date | |
|---|---|
| October 2026 | 11 (Sun), 17 (Sat), 23 (Fri), 29 (Thu) |
| November 2026 | 4 (Wed), 14 (Sat), 20 (Fri), 26 (Thu) |
| December 2026 | 2 (Wed), 8 (Tue), 13 (Sun), 19 (Sat), 25 (Fri), 31 (Thu) |
| January 2027 | 6 (Wed), 11 (Mon), 17 (Sun), 23 (Sat), 29 (Fri) |
| February 2027 | 4 (Thu), 9 (Tue), 15 (Mon), 21 (Sun), 27 (Sat) |
| March 2027 | 5 (Fri), 9 (Tue), 15 (Mon), 21 (Sun), 27 (Sat) |
| April 2027 | 2 (Fri), 7 (Wed), 13 (Tue), 19 (Mon), 25 (Sun) |
| May 2027 | 1 (Sat), 11 (Tue), 17 (Mon), 23 (Sun), 29 (Sat) |
| June 2027 | 4 (Fri), 9 (Wed), 15 (Tue), 21 (Mon), 27 (Sun) |
| July 2027 | 3 (Sat), 7 (Wed), 13 (Tue), 19 (Mon), 25 (Sun), 31 (Sat) |
| August 2027 | 4 (Wed), 10 (Tue), 16 (Mon), 22 (Sun), 28 (Sat) |
| September 2027 | 2 (Thu), 8 (Wed), 14 (Tue), 20 (Mon), 26 (Sun), 30 (Thu) |
| October 2027 | 6 (Wed) |
Method
Solar terms are the moments the Sun’s apparent ecliptic longitude reaches multiples of 15°, computed with Skyfield and the JPL DE421 ephemeris and given in Japan Standard Time. Old-calendar months begin on the JST date of each new moon; the month containing the winter solstice is month 11, and in a year with 13 months the first month without a principal term is the leap month. Rokuyō follow (month + day) of the old calendar; day signs follow the 60-day cycle. Seasonal days use the conventional definitions (e.g. setsubun = the day before risshun, hachijū-hachiya = the 88th day counting risshun as day 1). Dates were cross-checked against the National Astronomical Observatory of Japan’s published calendar.
About this page
All Senbu days in the coming year according to the rokuyō cycle of the old Japanese calendar.
Rokuyō are a traditional calendar notation still printed on Japanese calendars. They have no scientific basis; this site lists them only as a calendar convention.