The origin of not breaking ground for 0/8 days around beginning of winter.

Every year, the first18th day of beginning of winter is the king of the earth.

As a supplement to the 24 solar terms, the earth king is specially divided according to the five elements. Wood, water, fire and gold are based on each other for the time being, and there is no literature on earth for the time being. Therefore, there are 18 days in four seasons and 72 days in the whole year. It's called the king of the earth these days. Wood, water, fire and gold are reduced by 18 days every quarter, leaving about 73 days, thus successfully dividing the whole year into five parts. During this period, it is impossible to break ground to build houses, and naturally it is impossible to start construction.