Beginning of spring, Changxia, beginning of autumn and beginning of winter, the day before these four solar terms is called "Decisive Day". How did this name come from?

It's definitely cut off, not at all, exhausted, and the day is not over yet. The ancients observed the use of Tugui to measure shadows every day, knowing that the summer solstice is short, the winter solstice is long, the vernal equinox and the autumn equinox are equally divided, and yin and yang are even. So it is divided into two parts, and then there are four stands, beginning of spring, Changxia, beginning of autumn and beginning of winter. Therefore, it stands after death.

The day before beginning of spring, long summer, beginning of autumn and beginning of winter in the twenty-four solar terms is called "Decisive Day". "Yumen Jing" said: "Four unique people, four stand before a Chen Ye." There are four "unique days" in a year.

It sounds scary, but in fact, it is "Wang Mushui in early spring, Wang Mumu in long summer, Jin Wang in early autumn and Shui King Wang in early winter". Therefore, the first day is definitely also. " If the day you choose for your wedding or engagement is a "perfect day", there is absolutely nothing to envy, so be sure to check it carefully on the calendar! The day before the vernal equinox is called the Spring Festival. The day before the summer solstice is called the fire prevention period; The day before the autumnal equinox is called the golden calendar; The day before the winter solstice is called water separation. On the "yellow calendar", the words "leave Japan at four o'clock, don't use it for major events" must be written. This is a day that is generally avoided when choosing a day.

According to metaphysics, four days from the sun and four days from the sun are the time when the four seasons intersect and the seasons change from yin to yang. This reminds me of the research on chaos mechanism in the frontier science and technology field. I think that when the system reaches a certain critical value, there will be sometimes orderly and sometimes chaotic phenomena between systems. Is there any connection between the two? In the culture of choosing dates and numbers, there are eight days in a whole year that you don't have to think about, and you can never choose them. Therefore, there is still pressure in this regard.