Today (20th) is the spring equinox of the twenty-four solar terms of the lunar calendar, this day, the length of day and night is average, and it is the half of the ninetieth day of spring, so it is called "spring equinox". At the time of the spring equinox, most parts of the mainland have entered a bright spring, and spring is haunting and full of vitality.
The vernal equinox, the fourth of the twenty-four solar terms, is the earliest observed solar term node in history.
Tang Zhiqiang, deputy director of the Twenty-Four Solar Terms Research Center of the China Agricultural Museum: When the sun rises in the morning, it will form a shadow, and in the evening when the sun goes down, it will form a shadow, and when the two shadows form a straight line, this is the spring equinox and the autumn equinox, so the ancestors are the easiest to observe at this time.
In written records, the word vernal equinox first appeared in the Lü's Spring and Autumn.
From the phenological point of view, the day of the spring equinox is the arrival of the bird, which is said to be the spring equinox, and the swallows fly.
On the day of the spring equinox, the day and night are divided equally, and the yin and yang are equally divided, so in ancient times, they would choose this day to correct weights and measures. Due to the balance of yin and yang, people's mood during the spring equinox is mostly peaceful and self-motivated.
From the perspective of agricultural affairs, the spring equinox wheat rises, a moment is worth thousands of dollars, it is said that the wheat gets up at the spring equinox, and the field management of winter wheat is very important at this time. At the same time, spring ploughing and spring planting has also entered the busiest stage, during which spring wheat in the northeast, north China, northwest and other places began to sow seeds, rice in south China has been planted, and parts of Hunan, Jiangxi and Fujian have also reached the best time to sow bean crops.
During the spring equinox, the moisture conditions in most parts of the country are more suitable, and all localities can reasonably arrange production according to local conditions, and at the same time, they must also pay attention to drought and flood prevention.
Tang Zhiqiang, deputy director of the 24 solar terms research center of the China Agricultural Museum: Some areas in the south of huainan will be more rainy because of the rainfall, pay attention to drainage. In some areas of North China, when wheat gets up, it is still necessary to pay attention to watering and drought resistance. During the peach blossom flood season in Jiangnan, because of the heavy rain, it is necessary to drain the water. The peach blossoms bloom during the Yellow River flood season, some places melt the ice and snow, some do not melt, easy water will overflow, but also pay attention to the peach blossom flood.
Source: CCTV News