Detailed explanation: What are the dog days?

In ancient times, when people praised a person's progress, learning or practicing martial arts, in addition to using idioms such as smelling chickens and dancing, reflecting snow and catching fireflies, I am afraid that the proverb "practice for three days in winter and three days in summer" with obvious 24 solar terms was used the most. So, what is three volts? Why is summer practice a sign of hard work and progress? What are the characteristics of the climate in dog days? What is the dog days of 20 14? This article will answer you one by one.

The dog days are defined as the initial, middle and final days. The first and last days of each year are 10 days, and the middle days are 10 days or 20 days. The specific date of the dog days is determined by the solar term date and the dry branch date. Geng, ranked seventh in the heavenly dryness, belongs to gold in the collocation with the five elements, and gold is afraid of fire, which decreases day by day in the weather of several volts, so the ancients counted Geng Day as "volt". According to the traditional calculation method in China, the third and fourth Geng days from summer to the future are the start dates of the first (recumbent) and the second (recumbent) respectively, and the first Geng day after beginning of autumn is the first day of the last (recumbent). The length of the dog days is not exactly the same every year. If the middle section ends after beginning of autumn, it is 30 days. If the middle section ends before beginning of autumn, it will be 40 days (20 days in the middle section).

Dog days are characterized by high temperature, low air pressure, high humidity and low wind speed, and are the hottest season in a year. This is because, in summer, the day is longer than the night, the day is longer and the sunshine time is longer. The heat absorbed by the surface is far greater than the expenditure, which makes the heat accumulated on the surface increase day by day and the temperature continues to rise. In midsummer, that is, in dog days, the accumulation of surface heat reaches its peak. In summer, there is much rain and high air humidity, and the heat capacity of water is much larger than that of dry air, which is also one of the important reasons for the sultry weather.

The ancients lived in a bad environment, without air conditioning and electric fans. Imagine, if you practice martial arts under such difficult conditions, will it be a great test of people's willpower? No wonder it says "Summer training is in the dog days".

You may also like: the origin and significance of solar term Song 24. What does midsummer mean? When is midsummer 20 14? How did the lunar leap month come about? How to calculate leap month?

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