How was the time of the ambush determined? What is the calculation of ambush?

Introduction: Accommodation is the beginning of dog days. Lodging represents the arrival of hot weather, so lodging time is very important. The annual sleep time is uncertain, but within a certain interval, there are algorithms. So, when do you enter the volt? What is the calculation of ambush? If you want to know the calculation method of dive, just look at my introduction.

How to determine the entry time?

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 "chronology of trunk and branch" was popular, and 60 groups of different names were used to record the dates with 10 heavenly trunk and 12 earthly branch for recycling. 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 sooner or later, so there will be 30 days in some years and 40 days in some years.

What is the calculation of ambush?

From midsummer to the third Geng day in the future, it began to lurk. In ancient China, heavenly stems and earthly branches was used to record time. The figures of heavenly stems mainly include A, B, C, D and E, while the figures of earthly branches mainly include Zi, Ugly, Yin and Mao. Heavenly stems and earthly branches, Jia Zi, Yi Chou, Bing Yin, Ding Mao, etc. And cross them 60 times, so it's called Jiazi. "Three Geng" refers to meeting three characters of "Geng" and falling into an ambush on the third Geng day, that is, the first ambush.

When you enter the ambush, you will enter the dog days. "On the summer solstice, there are three gengzi, and the number of people is counted." This is the basis for establishing the initial ambush. The almanac stipulates: "The summer solstice is three Geng, and it must be several volts." It means "counting down from the solstice in summer", and it will begin to be subdued on the third Geng day. The "Geng Day" here refers to the days prefixed with "Geng" in the ancient "Ganzhi Jiri Law".

The date of Geng Day is changeable, not fixed, so the accommodation date is different every year, but the accommodation date is always between July 1 1 and July 20. The fourth to fifth Geng Day is moderate, and the first to second Geng Day after beginning of autumn is the end. Every Geng day is 65,438+00 days apart, and the number of mid-festival days is not fixed. There are four Geng days from summer solstice to autumn, with 65,438+00 days in the middle, five Geng days and 20 days in the middle.

Because the number of heavenly stems is 10, there is a Geng Day every 10 day, such as Geng Zi Day, Geng Yin Day and Chen Geng Day. 365 days a year (366 days in leap year) is not an integer multiple of 10. One day this year is Geng Day, and next year is not necessarily Geng Day. Due to the uncertainty of Geng day, the date of entering the hole is different every year. Simply put, from summer to the third watch in the future, the first (10 day), the middle (10 or 20 days) and the last (10 day) are the hottest days of the year.

How to spend the dog days?

1, Travel: Avoid going out at noon when the sun is strongest or the temperature is highest. When it is necessary to go out, do a good job of sun protection and remember to bring an umbrella! Remember to bring an umbrella! Remember to bring an umbrella!

2, hydration: the weather is hot, the human body is easy to sweat, regardless of the size of the activity, we must replenish water in time to increase the intake of liquid, can not wait for thirst before drinking water.

3, avoid greed: when we feel very hot, we want to drink a mouthful of ice water or blow air conditioning on the air conditioner. To reduce the fever, it's not. At this time, the brain mistakenly thinks that the heat inside the human body has dissipated, so the body will reduce and stop discharging heat, which makes it difficult for the body to dissipate heat and is more prone to heatstroke.

4, diet: the wind in July is lazy, even the clouds are getting hot, air conditioning cola watermelon, midnight beer with fish and shrimp, this is the most comfortable life in summer! It's hot in summer, so try to eat less thick and greasy food, let alone spicy food. Indigestible food will bring extra burden to the body and affect the digestive ability of gastrointestinal tract.