Nine-day metaphysics originated from Zhouyi, but it is higher than Zhouyi. It divides the four corners of gossip into Gan, Kun, Gen and Xun in detail. The palace is divided into two types: the big one is 12, and the small one is 1 1, which is called Jin Yang. Kun Palace is divided into Dakun and Xiao Kun, Xiao Kun is 8, which is flat soil, Dakun is 9, which is Gaoling soil; Roots are divided into big roots and small roots. Big roots are 3, which is alpine soil, while small roots are 2, which is water and mountain spring water flowing down from mountains. Xun Palace is also divided into big Xun and small Xun. Big smoke is 6, which means fire, and small smoke is 5, which means wind. This forms 12 directions. It is the number of 12, plus zero, it is the number of 13. There are 5 1840 geomagnetic fields and 12× 144 geomagnetic fields, and the array (after transformation) is13 =169, that is, from the original 8× 8 =.