How many days are in one volt, two volts, and three volts?

One Volt, Two Volt, and Three Volt are 10, 20, and 10 days each.

The three ambushes are the hottest period of the year, around early July to mid to late August on the solar calendar. The time of day when the ambush begins is not fixed for each year, and you need to check the calendar to calculate it. Each day with the character Geng is called a Geng day, which affects the length of the second ambush, which will be 30 or 40 days in some ambush years.

The first ambush is from July 11, 2023 to July 20, 2023, ****10 days; the middle ambush is from July 21, 2023 to August 9, 2023, ****20 days; the last ambush is from August 10, 2023 to August 19, 2023, ****10 days.

The dates of the three ambushes are determined by matching the dates of the twenty-four solar terms with the dates of the stem and branch chronicles. Because there are 10 days between each gengzhi, the first and last ambrosia are prescribed for 10 days. And because the 3rd geng day after the summer solstice (the first ambush) occurs at different times of the year, the number of days in the middle ambush will be longer or shorter.

The climatic characteristics of the three ambrosia days

The three ambrosia days are the time of the year when the temperature is the highest and it is humid and hot. "Into the ambush" after the air humidity increases, resulting in high humidity on the day of the three ambush is that the three ambush days blowing southeast wind, and southeast is the ocean, the air is humid, the humidity of the sea breeze caused by the humidity on the day of the three ambush is high. The high temperature and high humidity on the day of three volts is the climate characteristic of the southern region of China. The inland areas in the north are far away from the ocean and their climate is characterized by high temperature and dryness.

"Three Volts" and "Three Summers" (the twenty-four solar terms of Xiao Xia, Da Xia and Zhi Shi) all represent high-temperature extremes, and the curves on the time and temperature axes are basically the same, with the summer days coming and the summer days arriving; and the summer days fading and the summer months coming to an end. The reason why the ancients called the extremely hot days of the year "summer", and at the same time found a "volts" and its companion, in addition to the cultural meaning, another important purpose is for health considerations.

Refer to Baidu Encyclopedia - Three Volts Day