What does it mean that "everything is not suitable" is sometimes written in the "taboo" column in the imperial calendar?

There are several "nothing is appropriate" situations on the calendar:

1, the earthly branch of that day collided with the earthly branch of that year ~ called "year-old break";

2. The collision between the earthly branches of the sun and the moon is called "breaking the moon";

3. The "four days" in the twenty-four solar terms, that is, the day before beginning of spring, Changxia, beginning of autumn and beginning of winter, are called "four days";

The days before the vernal equinox, autumnal equinox, summer solstice and winter solstice in the 24 solar terms are called "four departures".

The so-called "everything is not suitable" means it is not suitable for doing great things. For example, getting married, opening a business, traveling (out of town), laying the foundation stone, moving into a new house, etc. , does not represent normal things in daily life!

Extended data

By the end of 20 19, the earliest existing calendar that used the year number of the Northern Song Dynasty was the 978 banknote book (No.S6 12) published by Dunhuang. In addition to the general calendar, this calendar is preceded by "national taboos" and "new students are too old this year, and immortals are really twelve years old".

At the beginning of the Northern Song Dynasty, the calendar was sold by people surnamed Hou, but because of its high price, the so-called mini-calendar was printed privately in China, and only one or two yuan was charged for each copy. In the fourth year of Zong Shenxi Ning (107 1), Wang Anshi, who implemented the new law, banned the private printing and sale of small calendars, and the government printed large calendars and sold them at a high price of several hundred yuan each.

Baidu Encyclopedia-Nothing fits.