Generally speaking, the time of ambush every year is probably in July, so when is the ambush this year? Why is the three dog days the hottest time of the year? Let's follow Xiaobian to find out the reason.
What is the date of ambush in 2018?
The lodging time in 2018 is July 17, 2018. From July 17, 2018 to July 26, 2018, it is the first time.
Tips: because 365 days in a year (366 days in leap year) are not integral multiples of 10, one day of this year is the day of Geng, and the next year is not necessarily the day of Geng. That is to say, the date of Geng day is variable and not fixed, so there are subtle differences in the date of ambush every year. Of course, the date of ambush is usually between July 11 and July 21.
Three dog days in 2018 schedule the first dog days in 2018: July 17, 2018 to July 26, 2018, the first dog days, 10 days
Medium voltage time in 2018: July 27, 2018 to August 15, 2018, medium voltage, 20 days
Last fall of 2018: August 16, 2018 to August 25, 2018, last fall, 10 days.
What is the "hot in three volts, cold in three Nineties" as the common people often say? The "hot in three volts" is the most humid and hot day in the year. The so-called "three volts" is the general term of the first, the middle and the last, which is determined according to the ancient "Ganzhi date method" of our country. It occurs from the middle of July to the middle of August every year.
Why is it the hottest in the dog days?
We know that after the summer solstice, although the day is shorter and the night is longer, the day is still longer than the night, and the heat absorbed by the ground is still more than the heat emitted every day, and the temperature near the ground is also higher day by day. During the three volt period, the heat absorbed by the ground is almost less than the heat emitted, and the weather is the hottest. In the future, the heat absorbed by the ground will be less than the heat emitted from the ground, and the temperature will slowly drop. Therefore, the hottest time of the year generally occurs in the three volts after the summer solstice.
How is the three dog days calculated?
The specific date of the three volts is determined by the date of the solar term and the date of the ganzhiji. Geng, ranked seventh in the heavenly stems, belongs to gold in the collocation with the five elements. Gold is afraid of fire and decreases day by day in the weather of several volts. Therefore, the ancients counted "volts" in terms of Geng days. According to the traditional calculation method of our country, the third and fourth day after the summer solstice is the start date of the first and second ambush respectively, and the first day after the beginning of autumn is the first day of the third ambush.
The duration of the three dog days is not the same. If the Zhongfu ends after the beginning of autumn, it is 30 days; if the Zhongfu ends before the beginning of autumn, it is 40 days (20 days).