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Kigensetsu - Empire day - Founding of Japan and accession of its first emperor Jimmu
2 month 11 day - February 11
The day of was defined as a national holiday in the Meiji period. and defined as February 11 on the gregorian calender from 1873.
The day was removed after the second worldwar.
The name was changed to national foundation day and re-established from 1966.