Since Imperial ceremonies are held according to Shinto rules, the separation of religion and politics was taken into consideration when they performed the funeral ceremony for Emperor Showa, which was the first national funeral ceremony after the revision of the Constitution in 1947.
皇室行事は神道に則って行われる為、1947年の憲法改正以後初となる昭和天皇の大喪の際には政教分離の原則への配慮がなされた。