Imperator's Day is a United Empire of Earth (UEE) holiday commemorating the unification of all Humans under one government, celebrated annually on July twelfth.
It was established as a holiday in SEY 2380 under the name Council Day to recognize the initial council that led the United Nations of Earth (UNE). When the United Planets of Earth (UPE) was founded in 2523, it became Tribunal Day, and in 2546 after Ivar Messer I established the UEE, it took on its current name. There have been recent petitions to change the name of the holiday again to reflect the diminished political importance of the Imperator role in the modern governance of the UEE.