The ancients divided the great summer heat into three periods: "One period of rotten grass is firefly; Second, wait for the soil to moisten the summer heat; When it rains, it will be fine. "
1, when the rotten grass turns into fireflies, fireflies egg out during the summer heat. The ancients believed that fireflies were changed by rotten grass. Fireflies, also known as "Candle Nights" and "Yao Nights", were poetic insects that greeted beginning of autumn in the summer. When fireflies shuttled in the quiet night, the cool autumn was not far away.
2, the second time the soil is moist and hot: the weather begins to be sultry and the land is very wet. It's wet, and in the heat, the humidity is heavy, and the heat and humidity are unbearable. Liu Xi of the Eastern Han Dynasty said: "Summer is boiling, the internal heat is down, the sun is up, and fumigation is damp and hot. If people are in a steamer, their gas is extremely dirty, which is also called' dirty heat'." .
3. When it rains three times: In the summer, it often rains heavily due to the accumulation of moisture, and there are often heavy thunderstorms.
Implication of great summer heat
The hottest period of the year.
Climatic characteristics of summer heat: high temperature, humid heat and frequent thunderstorms. High temperature and rainy, rain and heat at the same time, is conducive to crop growth. Yi Zhou Shu says: "The earth is moist and hot (hot, which means humid and sultry). Another five days, when it rains "; He also said, "The heavy rain will come from time to time, and the country will have no grace." The great summer heat is the period with the most sunshine, the highest temperature and the most abundant rain in a year, and it is a solar term with thunderstorm weather.
Because there are two links between solar radiation and atmospheric warming, it is influenced by many factors.
1, solar radiation warms the surface;
2. Ground radiation warms the atmosphere. It takes time for both links to reach the maximum, so the appearance of the highest temperature in the atmosphere will be postponed.
There are many factors in the process of the above two links. Among the many factors that affect the atmospheric warming, the most important one is the weather condition, with less rainfall, clear weather and high atmospheric temperature. From the summer solstice, the surface absorbs heat, and the temperature keeps rising, until the summer heat, the temperature just rises to the highest.