Twenty-four solar terms: What do you mean by moderate?
The second of the three volts. Also called two volts. It usually refers to the fourth Geng day from summer to the day before the first Geng day after beginning of autumn. Tang Jiaoran's Five Words Serve Lu Shijun Changyuan Water Hall to Enjoy the Cool: "In mid-June, Shuixuan is often sad." Song Huihong's "Summer Accompanies Yang Bangji to Make Tea Well": "It's hot and rainy, so Qiu Guang goes to the secluded home first." Ceng Gong's poem "Bitter Heat" in Song Dynasty: "I remember when I was in junior high school, I was depressed and resentful." See "Three Volts".
Dog days explain:
The specific date of the dog days is determined by the solar term date and the dry branch date. 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). Gengri is an auspicious day with the word "Geng", such as Gengzi, Gengyin and Chen Geng ... such dates are published in rural yearbooks every year.
Because the third and fourth Geng days are the first days of initial lodging and intermediate lodging, and the interval between each Geng day is 10 day, the initial lodging time is 10 day, and the final lodging rule is 10 day. The incubation time is long or short, which may be 10 day or 20 days. Every year, the third Geng day after the summer solstice solar term appears in the morning and evening, so the number of days in the middle is different, so there is a difference of 30 days in some years and 40 days in some years.
The dog days appear between the hot summer and the hot summer, and it is the hottest, humid and sultry day of the year.
The time of accommodation is not fixed every year, and the length of accommodation is also different. You need to check the almanac to calculate it. Simply put, we can use the formula of "Xia San Geng" to express the lodging date, that is, from the third Geng day in Xia Hou, the initial lodging is 10 day, the intermediate lodging is 10 day or 20 days, and the final lodging is 10 day. In ancient China, the "trunk-branch calendar" was popular, and 60 groups of different names were used to record dates with 10 heavenly stems and 12 earthly branches, which were recycled. The day with the word "Geng" is called "Geng Day". The word "Geng" in Geng Day is the seventh word in "A, B, C, D, E, Ji, G, Xin, Ren, Gui" 10 day, and it is repeated every 10 day. Starting from the summer solstice, according to the date of trunk, the third Geng day is the first, the fourth Geng day is the middle, and the 1 th Geng day after beginning of autumn is the last. When there are four Geng days between the summer solstice and the beginning of autumn, the middle part is 10 days, and when there are five Geng days, the middle part is 20 days. It seems that the emergence of Gengri will affect the length of the first half. So some years will be 30 days and some years will be 40 days.
The so-called "dog days" refer to the first, middle and last three Geng days, and their specific dates are calculated according to the ancient China dry branch method. In the twenty-four solar terms of China lunar calendar, the third Geng day after "summer" is the first, the fourth Geng day is the middle, and the first Geng day after "beginning of autumn" is the last.
The dog days are the hottest, the highest temperature and the most vigorous yang in a year. At this stage, the human body relaxes and the meridians and blood circulate, which is conducive to the penetration and absorption of drugs. Gengri is also related to lung gold (Gengri is gold, belonging to the large intestine, and the large intestine and the lung are both exterior and interior), which is the best opportunity to dispel potential cold pathogens by warming the lungs with yang. In addition, the acupoints of bladder meridian and Du meridian, which have the functions of warming meridians, dispelling cold, resolving phlegm and relieving asthma, are carefully selected for application. They complement each other and help to strengthen the body resistance and eliminate pathogens, so they can play a role in preventing and treating diseases.
The content has completely explained the origin and definition of the dog days in ancient China, but it can also be simply understood as: "Dog days" means that the weather is too hot to move, and it is the hottest 30 to 40 days in a year in the Central Plains. According to the lunar calendar, it is between mid-July and early August in the solar calendar.
I hope this helps.