What does the solar term in summer mean?

What does the solar term in summer mean?

2065438+July 22nd, 2007 is a traditional summer solar term. Do you know what summer solar terms mean? Let's get to know each other.

What does the solar term in summer mean?

Summer, one of the 24 solar terms, is between July 22nd and 24th in the northern hemisphere, and between October 20th and 265th, 438th and 0th in the southern hemisphere. The sun is located at longitude120th? .

Twenty-four solar terms say: Summer, heat, size, small at the beginning of the month, big in the month, and it is still hot now. ? Its climatic characteristics are:? Barrel refers to C as great summer heat, and the weather in Sri Lanka is fiercer than small summer heat, so it is called great summer heat. ? Is the summer solar term positive? Dog days? In the room? Zhongfu? Around, it is the hottest period of the year, with the highest temperature and the fastest growth of crops. At the same time, various meteorological disasters such as drought, waterlogging and wind disasters are also the most frequent in many areas.

Summer solar term phenology

In ancient China, the summer heat was divided into three stages: a rotten grass was a firefly; Second, wait for the soil to moisten and cool off the heat; Just when it rains heavily. ?

There are more than 2000 species of fireflies in the world, which are divided into aquatic and terrestrial species. Terrestrial fireflies lay eggs on hay, and when it is hot, fireflies ovulate, so the ancients thought fireflies were made of rotten grass.

The second weather is that the weather becomes sultry and the land is wet.

The third kind of weather is frequent thunderstorm, which weakens the heat and humidity, and the weather begins to transition to beginning of autumn.

Time calculation of summer solar terms

The solar term of summer heat is determined when the longitude of the sun runs to 120 degrees. Some people calculate the specific time by themselves, and there will be some errors. Purple Mountain Observatory is responsible for compiling and publishing the China calendar, which is published as a standard in the China Astronomical Almanac published every year, and published in the form of calendar data. The specific date is based on the calculation of Purple Mountain Observatory.

The general calculation formula is [y * d+c]-L.

Interpretation of the formula: Y= two digits after the number of years, D=0.2422, L= leap year, 2 1 century C=22.83, and 20th century =23.65.

For example: 2088 summer heat date =[88? 0.2422+22.83]-[88/4]=44-22=22, July 22nd.

Exception: 1922 plus 1 day.

Climatic characteristics of summer solar terms

high-temperature

Generally speaking, the summer solar term is the period with the most sunshine and the highest temperature in a year, the period with the most abundant rainfall, the most common thunderstorm and the most concentrated days with high temperature above 30℃ in western South China, and the period with the most frequent occurrence of high temperature above 35℃ in eastern South China.

The end of July to the beginning of August is the active period of the western Pacific subtropical high, which often occupies the eastern part of China. When it is strong, it can be controlled westward to the eastern part of southwest China, such as eastern Sichuan and Chongqing. Similarly, in summer, many areas of Chinese mainland are often controlled by continental high, which is also caused by subsidence and warming. Part of the cloudy and hot ground bakes the air to keep the temperature high.

Generally speaking, in hot days when the daily maximum temperature is higher than 35℃ (meteorologically called? Hot weather? ), the number of heatstroke has increased significantly. When the highest temperature of the day reaches above 37℃ (meteorologically called? Hot weather? ), the number of heatstroke will increase sharply, especially in the middle and lower reaches of the Yangtze River under the control of subtropical high. The sun is like fire, the wind is small and the humidity is high, which makes people feel sultry.

Nanjing, Wuhan and Chongqing along the Yangtze River, every year? Hot weather? The average is 17 ~ 34 days. Hot weather? There are still 3 to 14 days. In addition, Jiangxi Guixi, Hunan Hengyang, Sichuan Kaixian and other places, the annual average? Hot weather? It's been more than 40 days, and the whole middle and lower reaches of the Yangtze River is a big area? A stove? .

tornado