Excuse me, what does it mean to have a "closed day" in Luojia Meteorological Handbook?

This is a special term for geographical date selection. Its full name is: "The collapse of ice will destroy the door." Generally speaking, people who are not comparable to those who make a living by profession should not delve into what this means. This is not clear in one or two sentences. It is called this terrible name, just reminding people to be very cautious in geographical choice, not to mess around, to build the wrong place and choose the wrong day, which is a huge disaster! There is an example of this. For example, if the year is flat for two days, it is called ice collapse, also called death evil spirit. It means short life, afraid of peace and burial. For example, if it is not a year, it will be in silver moon. The day of extinction is the fourth day in silver moon, Uzuki, and it is also the day of dawn in .............. Hehe, every month is the day of extinction. The day of destruction is the day of disaster. For example, in the first month of the first month, Yihai rushed to destroy the door, and then Yihai was the day of great disaster. Similarly, Uzuki Bingzi's Killing Day! This is the day when ugly people are killed ... haha, there are many more, so I won't list them one by one. In short, the ancient imperial power was autocratic, and civilians could not bury it indiscriminately. Killing people in the wrong way is still a trivial matter, killing nine talents is a big deal! Of course, times have changed, so we can't forget the past ... it's scary to talk about it today!