Emperor Naruhito and Empress Masako will perform a ritual at the Imperial sanctuaries, a group of shrines in the Palace compound, on October 22.
The Imperial House ritual will be held ahead of "Sokuirei-Seiden-no-gi," a ceremony that will take place that same day to proclaim the Emperor's enthronement to the people of Japan and the world.
Starting at 9 a.m., the Emperor will report to the Sun Goddess, the souls of his ancestors, and various deities that the Enthronement Ceremony will be held on that day.
Dressed in a pure white traditional court wear, the Emperor will visit the main sanctuary called "Kashikodokoro" where the Sun Goddess is enshrined.
He will be accompanied by chamberlains carrying the sword and jewel, two of the three sacred treasures that symbolize the status of the Emperor.
He will bow and read out a text in Old Japanese to report that the ceremony to proclaim his enthronement will be held. The Emperor will also read out the text in the two other sanctuaries.
Later Empress Masako, in an ancient-style kimono and hairstyle, will visit the three Imperial sanctuaries.
The ritual will be attended by Crown Prince and Princess Akishino and other Imperial family members, as well as the country's leaders. They include the prime minister, the heads of both chambers of the Diet, the Chief Justice of the Supreme Court.