What is a four-day departure?

Four departures refer to the day before the vernal equinox, autumnal equinox, summer solstice and winter solstice, and are called departures from the sun.

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.

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Introduce four unique days.

Among the 24 solar terms throughout the year, the day before the vernal equinox, autumnal equinox, summer solstice and winter solstice is four days away from the sun. Four days away from the sun, ten days in a quarter, the ancients concluded that it was unlucky; Among the 24 solar terms of the four seasons, the day before beginning of spring, Changxia, beginning of autumn and beginning of winter is the four seasons. Si Li is the beginning of the four seasons, and Si Jue is the end of the four seasons.

According to China's ancient theory of Yin-Yang and Five Elements, water (winter) will be extinct when beginning of spring returns to spring, and wood (spring) will be extinct when summer gets hotter. 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.

Baidu encyclopedia-four departures and four unique skills

Baidu Encyclopedia-Four Unique Days