This celebrates the birthday of the reigning Emperor of Japan, which is currently Emperor Naruhito who was born on 23rd February 1960. It is enforced by a specific law, “The Law for Special Exception of the Imperial House Law concerning Abdication, etc of Emperor.” A decree was made by the Daijo-kan on 11th October 1868 to make the Emperor’s birthday a national holiday. Many citizens write letters to the Emperor during the week leading up to his birthday, and hang the Japanese flag the day of. A public ceremony takes place at the Tokyo Imperial Palace, where the gates are opened specially. The Emperor, accompanied by the Empress and several other members of the imperial family, appear on a palace balcony to acknowledge the birthday greetings of well-wishers waving Japanese flags. This event is called Ippansanga.