10. The hot summer is coming. Which solar term is it?

The arrival of hot summer refers to the summer solstice.

The summer solstice is the 10 of the 24 solar terms. Fighting means noon; The yellow meridian of the sun is 90 degrees; Gregorian calendar June 2 1-22. On the day of summer solstice, the position where the sun shines directly on the ground reaches the northernmost part of the year, almost directly on the tropic of cancer. At this time, the daylight hours in all parts of the northern hemisphere reach the longest in the whole year. For the Tropic of Cancer and its northern region, the summer solstice is also the highest day at noon in a year.

The solstice in summer is the turning point of the sun's northward movement. After the summer solstice, the direct point of the sun began to move south from the Tropic of Cancer, and the days in the northern hemisphere began to shorten gradually. For China, which is located in the north of the Tropic of Cancer, after the summer solstice, the height of the noon sun begins to decrease day by day; For China, which is located in the south of the Tropic of Cancer, after the summer solstice, the height of the sun returned to the south at noon, and it began to decrease day by day after the sun shone again.

Brief introduction of summer solstice weather

During the summer solstice, the temperature is high, the sunshine is sufficient, the crops grow rapidly, and the physiological and ecological water demand is high in most parts of China. At this time, the precipitation has a great influence on agricultural output, and there is a saying that "raindrops are worth tens of millions in summer solstice". At this time, the precipitation in the middle and lower reaches of the Yangtze River can generally meet the needs of crop growth.

After the summer solstice, the ground is heated strongly and the air convection is strong, which is easy to form thunderstorms. This kind of hot thunderstorm comes and goes, and the rainfall range is small. Heavy rains may occur in some areas, which may easily lead to floods and even threaten people's lives and property. Attention should be paid to strengthening flood control. Summer solstice season is the "Meiyu" season in Jianghuai area. This is the yellow ripening period of plums in Jiangnan. The air is very humid, and cold and warm air masses meet here to form a trough of low pressure, which leads to rainy weather.