《汉书·志·律历志上》
在甲脱出甲壳，在乙轧轧而出，在丙显然易见，在丁强盛壮大，在戊丰盛茂密，在已有形可认，在庚收敛改变，在辛都是新收成的，在壬怀孕，在癸进行测量。
出甲于甲，奋轧于乙，明炳于丙，大盛于丁，丰茂于戊，理纪于己，敛更于庚，悉新于辛，怀任于壬，陈揆于癸。
In Jia, it breaks out of its shell; in Yi, it spins out; in Bing, it is evident; in Ding, it is strong and robust; in Wu, it is abundant and luxuriant; in Ji, its shape can be recognized; in Geng, it draws in and transforms; in Xin, it is all newly harvested; in Ren, it conceives; in Gui, it is measured.