National Foundation Day (Japan)

National Foundation Day is a public holiday of Japan observed annually on the 11th February. The holiday has been celebrated since 1967, following the proclamation of it as a public holiday by a Cabinet Order the previous year. 11 February is the accession date of the legendary first Emperor of Japan, Emperor Jimmu at Kashihara-gū, converted into Gregorian calendar of 660 BC which is written in Kojiki and chapter 3 of Nihon Shoki. Coincidentally, 11 February 1889 is the day of the promulgation of the Meiji Constitution.

Japan is an island country in East Asia. Located in the Pacific Ocean off the northeast coast of the Asian mainland, it is bordered to the west by the Sea of Japan and extends from the Sea of Okhotsk in the north to the East China Sea in the south. The Japanese archipelago consists of four major islands alongside 14,121 smaller islands, covering 377,975 square kilometers (145,937 sq mi). Divided into 47 administrative prefectures and eight traditional regions, about 75% of the country's terrain is mountainous and heavily forested, concentrating its agriculture and highly urbanized population along its eastern coastal plains. With a population of over 123 million as of 2025, it is the 11th most populous country. The country's capital and largest city is Tokyo.

February 11 is the 42nd day of the year in the Gregorian calendar; 323 days remain until the end of the year.