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?

Absolutely cut off, not at all, exhausted, and the day is not over yet. The ancients observed the daily use of earth gauges to measure shadows, knowing that the summer solstice is short, the winter solstice is long, the vernal equinox and the autumn equinox are equally divided, and the yin and yang are equally divided. So it was divided into two parts, and then there were four stands, beginning of spring, Changxia, beginning of autumn and beginning of winter. So, it is standing after death.

Among the 24 solar terms, the day before beginning of spring, Changxia, beginning of autumn and beginning of winter 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 it is actually "Wang Mushui in beginning of spring, Wang Mumu in the long summer, Jin Wang in beginning of autumn and Shui King Wang in beginning of winter". Therefore, the first day is definitely also. " If the wedding or engagement date you choose 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 "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 "four days away from Japan, no major events" must be written, which is generally avoided when choosing a day.

Metaphysics, four days from the sun, four days from the sun, is the time when the four seasons intersect and the four 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 a phenomenon of order and chaos between systems. Is there any connection between the two? In the culture of choosing days and numbers, there are eight days in a year that you don't have to consider and you can never choose. So there is still pressure in this regard.