Which two of the 24 solar terms mean equal division of day and night?

Among the 24 solar terms, the vernal equinox and the autumnal equinox mean to divide the day and night equally, and there is a folk saying that the autumnal equinox and autumnal equinox are divided equally.

The vernal equinox is an important solar term, which is of great significance in astronomy: the northern and southern hemispheres divide the day and night equally. In climate, it also has obvious characteristics. Since then, the direct position of the sun has continued to move from the equator to the northern hemisphere. The day in the northern hemisphere began to be longer than the night, and the day in the southern hemisphere began to be shorter than the night.

In the autumn equinox, most parts of China have entered a cool autumn. The cold air from the south meets the gradually decaying warm and humid air, which causes repeated precipitation and the temperature drops again and again. As people often say, it's time for "an autumn rain and a cold", but the daily precipitation after the autumnal equinox will not be great. At this time, the field farming in the south and the north is different.

Extended data:

The traditional method of dividing the four seasons in our country takes the "four stands" in the 24 solar terms as the starting point of the four seasons and the dichotomy and dichotomy as the midpoint. For example, in spring, beginning of spring is the starting point, the vernal equinox is the midpoint, and the long summer is the end point.

The division of the four seasons in the west takes "dichotomy and dichotomy" as the starting point of the four seasons, such as spring as the starting point and summer solstice as the end point. Western countries are located at higher latitudes, far away from the intersection of Huangchi and Huangchi, and take "equal division to" as the starting point of the four seasons, which actually reflects the local climate better than "Li Si". The four seasons divided by "dichotomy" and "dichotomy" in the west are one and a half months later than those divided by "Li Si" in China.

Baidu encyclopedia-vernal equinox

Baidu encyclopedia-autumnal equinox