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What does the summer solstice mean? Climatic characteristics of summer solstice solar terms

The summer solstice term in 2019 is June 21. After the arrival of the summer solstice term, the weather will become more and more hot, and we can clearly feel the changes of temperature and climate. In China, there is a folk saying that three gengs count their heads at the summer solstice. What does this mean? The editor of this article will tell you the meaning of the summer solstice and the climatic characteristics of the summer solstice solar terms.

what does the summer solstice mean by three gengs counting their heads

'the summer solstice three gengs count their heads down '. According to astronomy experts, although the summer solstice indicates that the hot summer has come, it is not the hottest time, because the heat close to the ground continues to accumulate at this time and does not reach the maximum. From mid July to mid August, the temperature is the highest in all parts of China.

The summer solstice three Geng days is one of the methods to calculate the dog days in the Chinese lunar calendar. It means that the third Geng day is the first day of the dog days from the summer solstice.

In ancient times, tiangan and dizhi were combined to record time. The word "Geng" in the three gengs was the seventh word of the 10 tiangan numbers "a, B, C, D, e, oneself, Geng, Xin, Ren and GUI", which was repeated every 10 days.

According to this formula, we can calculate the time of head fall every year.

Climatic characteristics of summer solstice

(1) Convective weather

After the summer solstice, the ground is heated strongly and the air convection is strong. Thunder showers are often formed from afternoon to evening. This kind of hot thunderstorm comes and goes quickly, and the rainfall range is small. People call it 'summer rain across the fields'. Liu Yuxi, a poet of the Tang Dynasty, once cleverly borrowed this kind of weather and wrote a famous poem "the sun rises in the East and rains in the west, but there is sunshine in the road". The heavy precipitation brought by convective weather is not as beautiful as described in the poem, and often brings local disasters. The poet Xu Shuxin's poem "in summer rain" also appropriately describes the thunderstorm weather in summer: "in summer, the wind is blowing in the summer, and the frogs chirp and cicadas attack the dust. The blue sky thunders, the golden gong rings, and the cold rain pours on my face like money. "

(2) Rainstorm weather

In most cases, the 'Summer Solstice' period coincides with the plum rain in the middle and lower reaches of the Yangtze River and the Jianghuai River Basin, with frequent rainstorms, which is easy to form flood disasters and even threaten people's lives and property. Attention should be paid to strengthening flood control.

(3) Jianghuai Meiyu

The summer solstice is the 'plum rain' season in the Jianghuai area. At this time, it is the Yellow ripening period of plums in the south of the Yangtze River. The air is very humid. Cold and warm air masses meet here and form a low-pressure trough, resulting in continuous overcast and rainy weather. In such weather, the utensils are moldy and the human body feels uncomfortable. Some mosquitoes reproduce very fast, and some intestinal bacteria are also easy to breed. At this time, pay attention to the hygiene of drinking water and try not to eat raw and cold food to prevent the occurrence and spread of infectious diseases.