Celebrated annually on the middle day of a three-day holiday, tor'Raman Day is the national holiday to commemorate the crowning of the Koridian emperor. The actual date changes for each Raman, obviously dependent on the actual crowning date. Only the current Raman's crowning date is celebrated. Past emperors are given no recognition once they cease to be the Raman.
For example, Raman Gregor was crowned on 18 Shall. This date will be celebrated every year of his reign.