What does the Spring Equinox mean?

The Spring Equinox is one of the 24 solar terms. The equinox of 90 days in spring is about March 20 every year in the Gregorian calendar. When the sun is at 0 degrees of the yellow longitude (vernal equinox), the sun shines directly at the earth's equator on this day. The seasons in the northern and southern hemispheres are opposite. The northern hemisphere is the Spring Equinox. In the southern hemisphere, it is the Autumn Equinox. Let's take a look at what the Spring Equinox means.

When was the Spring Equinox?

The Spring Equinox usually refers to the time when the sun sees the yellow longitude at 0 degrees, around the 15th day of February of the lunar calendar (about March 20-21 in the Gregorian calendar). In the time period, it also refers to the position of the sun between 0 and 15 degrees longitude, that is, the period from the spring equinox to the Qingming Festival, while the Gregorian calendar is about March 20 to April 5.

The relationship between the Spring Equinox and Agriculture

In the areas where there is little rain in spring in the north, we should pay close attention to spring irrigation, water saving water, jointing fertilizer, and pay attention to preventing frost damage at night, while the south still needs to continue to do a good job in drainage and waterlogging prevention. The work of raising seedlings of early rice in Jiangnan and Jianghuai region has begun, and the cold and warm weather in early spring changes frequently, so we should pay attention to soaking seeds and accelerating germination when cold air is coming, and sowing seeds when cold air is over. The experience of the masses said: "if you have a cold tail and a warm head, you will not be worried about planting seedlings." According to the weather conditions, try to have 3-5 sunny days after sowing to ensure that the whole seedling is sown. Spring tea has begun to sprout, so quick-acting fertilizers should be applied in time to control diseases and insect pests and strive for high yield and high quality of tea.

As the saying goes, "the Spring Equinox wheat gets up, fat water should follow closely." A spring rain and a warm, busy ploughing the fields after the spring rain. The busy spring season is about to begin, and spring tube, spring ploughing and spring planting are about to enter the busy stage. After the Spring Equinox, the overwintering crops entered the growth stage, and field management should be strengthened. Due to the rapid rise in temperature and relatively large water demand, farmers should strengthen water storage and soil moisture conservation. The Spring Equinox Mai gets up, a moment is worth thousands of dollars.

Climatic characteristics of the Spring Equinox

1. Sunlight: the Spring Equinox, on this day, the sun shines directly on the equator, day and night are almost equal, and then the direct sunlight gradually moves northward, and the northern hemisphere begins to have longer days and shorter nights. The Spring Equinox is a relatively important solar term, which not only has astronomical significance: the northern and southern hemispheres are equally divided between day and night, but also has more obvious characteristics in climate. The Spring Equinox season, except for the Qinghai-Tibet Plateau, the northeast, the northwest and the northern part of North China, China has entered a bright spring, in the vast land, willow green, Yingfei grass long, wheat jointing, rape flower fragrance.

2. Pressure condition: the Spring Equinox solar terms, the East Asian trough is obviously weakened, the westerly trough ridge activity is obviously increased, there is often low pressure activity and cyclone development from Mongolia to Northeast China, the low pressure movement leads the cold air to the south, and there are strong winds and blowing sand weather in the north. When the long wave trough moves eastward, affected by the confluence of cold and warm air masses, there will be continuous overcast and rainy weather and cold weather in late spring.

3. Temperature and precipitation: during the the Spring Equinox season, except for the cold mountain areas that are winter all year round and areas north of 45 degrees north latitude, the daily average temperature in all parts of China has steadily risen to more than 0 ℃. At this time, the severe cold has passed, and the temperature has risen rapidly, especially in North China and the Huang-Huai Plain, where the daily average temperature has almost reached more than 10 ℃ at the same time as the rainy south along the Yangtze River and entered the bright spring. In the vast land, the bank willow is green, the warbler grass is long, the wheat jointing, the rape flower is fragrant, the peach red Li Bai welcomes the spring yellow, and South China is a scene of late spring. In terms of the law of climate, the precipitation in the south of the Yangtze River increased rapidly at this time, and entered the "peach blossom flood" period in spring. in the vast areas of Northeast, North and Northwest, where "spring rain is as precious as oil", there is still little precipitation, and resisting the threat of spring drought is the main problem in agricultural production.