What do you mean by "expensive day" and "expensive night" in the eight characters? What is the difference?

It's expensive, and it's right to sit in the sky. This grid has only four days: Ding You, Ding Hai, Gui Si and Gui Mao. The main people are pure, kind, beautiful and not arrogant. It is a blessing to have wealth, food and printing together. I like the combination of houses and tombs in Sanliuhe, and the nobles are rich and blessed. Avoid punishment and break the harm, and die in the air. Before we meet again after surgery, I will attend meetings in my traditional life and see more of Kui Gang, so I will decide to become poor. If you fail, it doesn't matter. The day will be divided into day and night, and the day will give birth to Ding Hai and the night will give birth to Ding You. Day and night are not all decent.

Gui Yue doesn't know.