The common system of marking years, adopted across the Northern Continent due to the cultural influence of the Holy Kingdom of Harmonia. The Solar Year Calendar was established when Hikusaak took the position of High Priest and began his theocratic rule over Harmonia, two years after the Aronia Kingdom was overthrown and Harmonia established in its place. As such, the year in which Hikusaak became High Priest is marked as year 0.