Even supposedly otherwise primitive cultures knew how to regulate time by the motions of the Sun throughout the course of the seasons. The concept of a 360ish day calendar is nothing recent and in fact predates written records.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'