The usual methods can be divided into two categories:
Experts in the history of astronomical literature like to use modern astronomical means to calculate the time when it should appear according to some special astronomical phenomena or data recorded in Zhoubingsuanjing, so as to determine its completion time. For example, Japanese scholar Nakata calculated the writing date of the book from the 5th century BC to the 7th century BC according to the distance between the North Star (Xuan Ji in the Arctic) and the North Celestial Pole in the Book of Changes.