National Day of Japan, 11 February
It marks the traditional date on which according to legend Emperor Jimmu founded Japan in 660 BC.
Japan switched from the traditional Japanese calendar - a lunar calendar based on the waxing and waning of the moon - to the Gregorian calendar starting in January 1873.
It was at this time that the day of the enthronement of Emperor Jinmu, the first Japanese emperor, was made a national holiday and named Empire Day (Kigen-setsu). February 11th 660 BC was determined as the day of enthronement by calculating the date in the solar calendar corresponding to the date recorded in the Chronicles of Japan, Japan's first history compiled on imperial orders.
Sources:
National Foundation Day in Japan in 2022. (2022). https://www.officeholidays.com/holidays/japan/japan-national-foundation-day
Relationship between Assumption University of Thailand and Japan
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