Is the day before the severe cold a perfect day?

Yes, the last day of winter, the last day of the Great Cold Festival, is a "unique day" of winter.

There are four seasons in a year, and the last day or the day before the start of each season is called the last day.

The last day of spring, the last day of Grain Rain Festival, is the "last day" of spring.

The last day of summer, that is, the last day of the Great Summer Festival, is a "unique day" in summer.

The last day of autumn, that is, the last day of the first frost festival, is the "last day" of autumn.

The last day of winter, that is, the last day of the Great Cold Festival, is the "unique day" of winter.

Therefore, there are four "unique days" throughout the year.

The ancients thought these four days were unlucky.

There are four seasons in a year and 24 solar terms in a year. 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. Four parting is the beginning of four seasons, and four unique seasons are the end of four seasons. The ancients were afraid of exhaustion and decided it was unlucky.