What does it mean to celebrate a day with 66 and a day with 99?

Heaven takes 66 as the control, and the tunnel takes 99 as the number, which conforms to the accuracy of heaven.

Sixty-six is the solar term: there are ten dry days, which means ten days. Ten dry days are circulated six times to form a week, which is repeated six times and ends in one year. This is the calculation method of 360 days.

Since ancient times, communication with the weather is the foundation of life, and this is nothing more than the yin and yang of the sky.

In Kyushu, people's nine tricks are all connected with the weather. Heaven is derived from five elements, and Yin and Yang are divided into three according to their ups and downs. Three gases are combined into heaven, three gases are combined into earth, and three gases are combined into adults. (Here, 3+3+3=9) Three qi are combined into nine qi, which are divided into nine fields of ground qi, nine dirty bodies, four dirty bodies and five internal organs of spirit, which are combined to cope with the weather.