Autumnal Equinox Day
Encyclopedia
is one of the public holidays in Japan that usually occurs on September 22 or 23, at the date of autumnal equinox in Japan Standard Time
Japan Standard Time
Japan Standard Time or JST is the standard timezone of Japan, and is 9 hours ahead of UTC. For example, when it is midnight in UTC, it is 09:00 in Japan Standard Time. There is no daylight saving time, though its introduction has been debated several times. Japan Standard Time is the same as...

 (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 declared official until February of the previous year. Autumnal Equinox Day became a public holiday on 1948. In 1947 and before, it was the date of , 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
Constitution of Japan
The is the fundamental law of Japan. It was enacted on 3 May, 1947 as a new constitution for postwar Japan.-Outline:The constitution provides for a parliamentary system of government and guarantees certain fundamental rights...

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