Climatic characteristics of vernal equinox: there is much rain, and rice welcomes sowing date.

After the arrival of the vernal equinox, the most remarkable climate feature on the earth is the increase of water. Precipitation in most areas has increased significantly, and the temperature has shown signs of warming up. The average temperature once exceeded 10 degrees. The arrival of the vernal equinox marks the official arrival of the Spring Festival. Whether around the vernal equinox, the climate in most areas is extremely mild and the precipitation is extremely rich. After the rainy season, the sunshine will be particularly bright. Therefore, plants can formally enter the growth stage, and rice will usher in the sowing period.

As we all know, the twenty-four solar terms are the theoretical knowledge summarized by the ancients through climate change, and the vernal equinox is one of the twenty-four solar terms, ranking fourth. From the beginning of each year, there are 24 solar terms, and the vernal equinox ranks fourth, marking the arrival of the Spring Festival. Spring is a busy season for agriculture, and it is also a time for crops to grow. Once spring comes and the temperature rises, many crops will formally enter the growth period.

Many farmers use the vernal equinox as the main signal to decide whether to sow. The establishment of the vernal equinox has strict scientific basis. If the sun shines directly on the equator of the earth, the day and night in the northern and southern hemispheres are equal, and there is no place where the day is longer than the night, or the night is longer than the day. In ancient times, people called this period from beginning of spring to long summer the vernal equinox, which is actually the intermediate stage of the transition from spring to summer.

Second, there are many customs. If the sun shines directly at the longitude of 0 degrees, the time will come to March 19 or March 22 every year, and the vernal equinox will arrive. When the vernal equinox comes, the sun slowly moves northward from the original direct equator, so the length of day and night in the northern and southern hemispheres is also affected. Moving the direct point of the sun to the north means that the northern hemisphere can receive more solar radiation, which makes the days longer and the nights shorter in most areas.

The law of the southern hemisphere is just the opposite of the law of the length of day and night in the northern hemisphere. The vernal equinox not only means the change of the length of day and night, but also means that the water in most areas will gradually become abundant and the ground temperature will rise. The vernal equinox has a great influence on human beings. At this time, not only the precipitation is extremely abundant, but also individual temperatures will be extremely mild. When the sun is clear, the earth will receive more solar radiation. In the past, people set up many customs on the vernal equinox, including offering sacrifices to birds and sowing seeds.