Is it important to choose 28 nights for burial?

This is not important, because it depends on the needs of the times. The specifications of the tomb are different, so it is needless to say the importance of choosing a date. According to known archaeological examples, there were 28 paintings painted on Ceng Houyi's coffin during the Spring and Autumn Period and the Warring States Period. Therefore, the tombs at that time attached great importance to the application of 28 huts in choosing dates. The ancients thought it was very important to choose a day when the sky fell, the earth was uploaded, the gods were hidden, and the ghosts avoided. Modern geomantic omen still follows the ancient system of choosing a day, using stars as well as possible and avoiding bad stars as much as possible.