The twenty-two cycles were divided into thirteen "heaven" cycles, which began in AD 843 and ended in 1519, when the nine "hell" cycles began, ending 468 years later in 1987.
这22个周期又被划分为13个“天堂周期”（heaven），开始于公元843年并结束于1519年，其后9个“地狱周期”（hell）开始,持续468年后结束于1987年。