Autumnal Equinox Day

For the general topic, see equinox.
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]

YearVernalDay of weekAutumnalDay of week
2013March 20WednesdaySeptember 23Monday
2014March 21FridaySeptember 23Tuesday
2015March 21SaturdaySeptember 23Wednesday
2016March 20SundaySeptember 22Thursday
2017March 20MondaySeptember 23Saturday
2018March 21WednesdaySeptember 23Sunday
2019March 21ThursdaySeptember 23Monday

See also


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