Based on this idea, the Kanototori year, which was the first year of the former 21 cycles from the Kanototori year of 601 when a capital was placed at Ikaruga, was defined as the first year of the first period and the year of the enthronement of Emperor Jinmu on the assumption that the beginning of Japan was the first revolution.
この思想で考えると斑鳩の地に都を置いた推古天皇9年（601年）の辛酉の年より二十一元遡った辛酉の年を第一蔀のはじめの年とし、日本の紀元を第一の革命と想定して、神武の即位をこの年に当てたのである。