? Their relationship can be simply stated as follows: As one of the solar terms, "beginning of autumn" is around August 8th of the Gregorian calendar, and the last 10 day of "dog days" is after "beginning of autumn", or it can be said that the last 10 day of "dog days" is basically in "beginning of autumn".
? Therefore, it can be said that the relationship between them is overlapping and overlapping.
? If you need to know more about this problem, please continue to read the details below.
I. What is "beginning of autumn"? "beginning of autumn" is one of the 24 solar terms in China, ranking first among the six solar terms in autumn.
? The so-called "beginning of autumn" means that autumn begins on this day. "Li" means to establish and form, just like beginning of spring, Chang Xia and beginning of winter. And "autumn" means that the crops are ripe. Therefore, the beginning of autumn is the beginning of autumn and the beginning of harvest season.
? After the "beginning of autumn", we have to go through five solar terms, namely, summer heat, white dew, autumn equinox, cold dew and first frost, before we can turn to winter.
? Because this is beginning of autumn, it is still in the alternate stage of hot summer and cool autumn. The biggest feature of this season is that it still retains the "afterglow" of high temperature in summer, because the temperature change is not a cliff-like decline, but a gradual decline.
? During the "beginning of autumn" period, generally speaking, it is a period of continuous high temperature, even a period of high fever. This period of time is called "autumn tiger". It can be seen that beginning of autumn season still belongs to the stage of high fever.
? However, after all, it is autumn when we enter beginning of autumn. No matter how fierce the afterglow in summer is, it will not last long after all, and the overall trend is downward.
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? The temperature difference between day and night in early autumn is also great. Bai Juyi, a poet in the Tang Dynasty, once wrote: "In the early autumn evening, the cool breeze suddenly rises and the summer heat disappears slightly." This means that in the early autumn night, the cool breeze blows gently and the summer heat is relieved.
? Once beginning of autumn entered the "hot summer", the temperature dropped significantly. A poet in the Tang Dynasty said that "beginning of autumn will not be too hot in the future", which makes sense.
Second, what is "three volts"? The proverb says "it's hot in dog days". That's true. The hottest time in summer is in the "slight summer heat" and "great summer heat", which is even worse. However, due to the influence of inertia, there is an "autumn tiger" after the "Great Summer" and the first solar term "beginning of autumn" in autumn. Therefore, the really hottest time should be in the three solar terms of "Little Summer", "Big Summer" and "beginning of autumn" for about 40 days.
? The hottest time was more than 40 days, and the ancients gave a proper term, called "three volts", which was divided into initial, middle and final volts. What does "v" mean? "Fu" originally meant to lurk and hide, but it can be understood as "summer vacation" here.
So, how did the ancients explain this "three volts"? Here, I'll quote the information to illustrate it first, and then explain it.
? "Book of Yin and Yang" was learned at the beginning of the fourth year, saying: "From the summer solstice, the beginning of the third boxer, the middle of the fourth boxer and the beginning of beginning of autumn are called three volts."
? According to ancient records, the dog days began after the summer solstice, and the "falling" began after the summer solstice. What does this mean? That is to say, the number of "Geng Ri" began from "summer", that is to say, from the day when the word "Geng" of dry day was included in dry day, it was the beginning of "first falling"; Then greet the next "Geng Day" and enter "Zhongfu"; The next "Geng Day" will enter the "final stage".
? The gap between "Geng" and "Geng" is 10 days. So "dog days" are basically "thirty days". Of course, due to the special situation of "Geng Day", it becomes "midrange" for 20 days, and then "three volts" becomes 40 days. In short, the dog days are thirty or forty days.
? It is out of fashion to calculate the date with "Geng Day". As for the time of "three volts", let's use the authoritative statement in Ci Hai to explain it. Ci Hai said: "From ambush to ambush, it is equivalent to the middle of July to the end of August in the solar calendar."
Third, the relationship between beginning of autumn and Sanfu? The above content has made it clear what is going on between beginning of autumn and Sanfu, which actually involves the relationship between them. Let's sum it up.
? "beginning of autumn" and "Sanfu" are similar: they are both concepts used by the ancients to express time, and the time points they represent overlap, which is about the middle and late August of the Gregorian calendar; The time period they represent is characterized by high temperature and high fever. Yuan Zhen, a poet in the Tang Dynasty, said that "the fire is still there", and this "dormant" was also a "beginning of autumn" period.
? The difference between "beginning of autumn" and "Sanfu" is that "beginning of autumn" is a concept of solar terms, while "Sanfu" is a concept of "high temperature period" with different categories. In addition, "beginning of autumn" belongs to autumn, while "Sanfu" is inter-seasonal.
? Finally, I'll send you two Tang poems that write "three volts" to let you feel the power of "reducing demons":
? Zhang Jiuling: Wan Li Road, Myanmar, Hershey is in dog days. Fly away and escape into the depths of the forest, and the flow will be flawed.
? Quan Deyu: A three-volt drum furnace is a sick man. Tired sleep is like fire and thirsty is like beads. Fear, anxiety, boredom. When will it rain a little, because of the downwind.
? "He Xi" in the poem refers to "the appearance of hot summer"; "Yi" is pronounced chuò, which means "drinking".