Autumnal Equinox Day
| Autumnal Equinox Day | |
|---|---|
| Official name | Autumnal Equinox Day |
| Observed by | Japan |
| Type | National |
| Significance | Commemorates the autumnal equinox |
| Date | Autumnal equinox |
| 2015 date | September 23 |
| Frequency | annual |
Autumnal Equinox Day (秋分の日 Shūbun no Hi) is a public holiday in Japan that usually occurs on September 22 or 23, the date of Southward equinox in Japan Standard Time (autumnal equinox can occur on different dates for different timezones). Due to the necessity of recent astronomical measurements, the date of the holiday is not officially declared until February of the previous year. Autumnal Equinox Day became a public holiday in 1948. In 1947 and before, it was the date of Shūki kōreisai (秋季皇霊祭), an event relating to Shintoism. Like other holidays, this holiday was repackaged as a non-religious holiday for the sake of separation of religion and state in Japan's postwar constitution.
Recent Japanese equinoxes
Past observed and future calculated equinoxes in Japan Standard Time.[1]
| Year | Vernal | Day of week | Autumnal | Day of week |
|---|---|---|---|---|
| 2013 | March 20 | Wednesday | September 23 | Monday |
| 2014 | March 21 | Friday | September 23 | Tuesday |
| 2015 | March 21 | Saturday | September 23 | Wednesday |
| 2016 | March 20 | Sunday | September 22 | Thursday |
| 2017 | March 20 | Monday | September 23 | Saturday |
| 2018 | March 21 | Wednesday | September 23 | Sunday |
| 2019 | March 21 | Thursday | September 23 | Monday |