The abdication ceremony -- the "Taiirei-Seiden-no-gi" --will be held in the State Room in the Imperial Palace. It will be the first of its kind in over two hundred years.
At 5:00 p.m., Emperor Akihito will enter behind senior officials of the Imperial Household Agency.
Chamberlains will follow... carrying the Imperial Regalia, a sacred sword and jewel. They're proof of enthronement.
The State and Privy Seals will also be brought in.
Other members of the Imperial family -- including Empress Michiko, Crown Prince Naruhito and Crown Princess Masako, Prince and Princess Akishino -- will also enter.
Then, the chamberlains will place the Imperial Regalia and the seals on stands.
Next, Prime Minister Shinzo Abe will deliver an address on behalf of the Japanese people.
Emperor Akihito will then give his last speech in his current role.
The ceremony is scheduled to last about 10 minutes.
Around 300 people are expected to attend. They include the Prime Minister, the heads of both chambers of the Diet, the Chief Justice of the Supreme Court, and local government leaders.