Sihe: Heaven, Earth, Man, and Ji.
1. Surrounded on all sides. Han Bangu's "Western Capital Fu": "People are not allowed to care about, and cars are not allowed to spin. The city of Khotan is overflowing with the country, and hundreds of silks are flowing beside it. The red dust is everywhere, and the smoke and clouds are connected." "New Tang Book: Tubo Biography": "Begging for information and seeing There were few soldiers, and they were all chasing him. They fell into an ambush, and the four soldiers attacked quickly, so they killed them and presented them to the capital. " Pu Songling of the Qing Dynasty "Liao Zhai Zhiyi·Ying Ning": "There are three couplets of thatched cottages, surrounded by flowers and trees. ”
2. The four sides cooperate; the four sides correspond. "Book of Han·Er Kuan Zhuan": "Six rhythms and five tones, quietly praising the holy meaning; four combinations of divine music, each with its own square image." Han Yu of the Tang Dynasty's poem "Biansi Exchange Presented to Zhang Pushe": "It's rare to find a clever expression and a strong spirit." , the cheers of the heroes shouting "Sihe" 3. It is an eight-character term, Tiandi refers to the heavenly stems and earthly branches, Tianhedihe means that the heavenly stems and earthly branches are all in harmony, Renhe refers to the sun and heavenly stems, and Jihe refers to the sun. Generally speaking, the two pillars of the Earthly Branches are combined. For example, the moon pillar is Renyin, the sun pillar is Dinghai, Dingren combines with chemical wood, and Yinhai combines with chemical wood, both are wood.