What is the name of the day before each solar term in geomantic omen?

Working people in ancient China divided a year into 24 solar terms by studying the movement of nature and celestial bodies. The four solar terms refer to the day before the vernal equinox, autumnal equinox, summer solstice and winter solstice, and the day before beginning of spring, Changchun, beginning of autumn and beginning of winter. The saying that four days are apart is mainly to remind people that some important days in daily life should be carried out according to the time nodes of natural laws.

Li Si

The day before the vernal equinox, autumnal equinox, summer solstice and winter solstice in 24 solar terms is technically called "leaving the sun". There are four such days throughout the year, so it is called "four days away from the sun".

"Yumen Jing" said: "Those who leave, Yin and Yang belong to the previous dynasty." The vernal equinox and the autumnal equinox, even the summer solstice and the winter solstice. The day before means the day before. 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. The word "four days away from the sun" must be written on the yellow calendar, which is a day to be avoided when choosing a day.

Four musts

"Yumen Jing" said: "Four unique people, four stand before a Chen Ye." That is to say, among the 24 solar terms, the day before beginning of spring, Changxia, beginning of autumn and beginning of winter is called "sleep day", and there are four such days throughout the year, so it is called four sleep days.

According to China's ancient theory of Yin-Yang and Five Elements, "beginning of spring is prosperous in water, long in summer is prosperous in wood, beginning of autumn is prosperous in soil, and beginning of winter is prosperous in water and gold. Therefore, the first day is a must. " It means: after beginning of spring, spring will return to the earth, water (winter) will be extinct, and after long summer, it will be hotter and wood (spring) will be extinct; When it gets cold in early autumn the day after tomorrow, the fire (summer) goes out, and when it gets cold in early winter the day after tomorrow, the gold (autumn) goes out. Therefore, the day before the establishment of the four pillars is called four days.

Four-day holiday must be written on the yellow calendar as "four-day holiday, not for big events", which is generally avoided when choosing a day.