How many days are there between the solstice of winter and the beginning of spring?

45 days apart, winter solstice is slight cold, severe cold and beginning of spring in turn, and every 15 day is a solar term; The trajectory of the sun in one year is divided into 24 equal parts, each equal part is 15, and each equal part is a solar term, which starts in beginning of spring and ends in severe cold.

Each solar term represents different changes in climate, phenology and time. China's lunar calendar is a combination of yin and yang, which is based on the movement of the sun and the moon, so adding 24 solar terms can better reflect the cycle of the sun's movement.

It is a knowledge system formed by observing the movement of the sun in a year and understanding the changing laws of the four seasons, climate and phenology in a year.

Extended data:

The solar terms reflecting the changes of the four seasons are: beginning of spring, Spring Equinox, Long Summer, Summer Solstice, beginning of autumn, Autumn Equinox, beginning of winter and Winter Solstice. Among them, beginning of spring, Changxia, beginning of autumn and beginning of winter are collectively called "Sili", which means the beginning of the four seasons.

There are five solar terms reflecting temperature changes: slight summer heat, great summer heat, summer heat, slight cold and severe cold.

There are seven solar terms reflecting weather phenomena: rain, Grain Rain, white dew, cold dew, first frost, light snow and heavy snow. There are four solar terms reflecting phenological phenomena: Jing Zhe, Qing Ming, Xiaoman and Mang Zi.

References:

Baidu encyclopedia-solar terms