What is the relationship between accommodation and summer solstice?
The summer solstice is not a crouching. Every summer solstice, the number of people will decline, that is to say, from summer solstice to the third "Geng Day", it began to decline.
The solstice in summer is not the hottest time of the year. Because, close to the surface of the heat, at this time still continue to save, did not reach the maximum time. As the saying goes, "it's hot in dog days", but the real hot weather is calculated according to the summer solstice and autumn. From mid-July to mid-August, the temperature is the highest in all parts of China.
The summer solstice is also the highest day at noon in a year. In Beijing, the height of the sun is as high as 73 32' at noon from summer to Sunday. On this day, the northern hemisphere received the most solar radiation, almost twice as much as the southern hemisphere. At this time, the southern hemisphere is in the middle of winter.
"Summer Nine Nine" is based on the date of summer solstice, and every nine days is a nine. There are 8 1 day in September and September every year. Similarly, March 9 and April 9 are the hottest seasons of the year. It is in sharp contrast with "Winter 99", but unfortunately it has not been widely circulated. In fact, "Summer of 1999" really vividly reflects the relationship between date and phenology.
How to calculate the third Geng day of summer solstice?
In ancient China, heavenly stems and earthly branches combined to record time. The number of heavenly stems is 10, which is A, B, C, D, E, Ji, G, Xin, Ren and Gui, and the number of earthly branches is 12, which is Zi, Ugly, Yin, Mao, Chen, Si, Wu, Wei, Shen, You and Xi. Match heavenly stems and earthly branches, and you will get Jia Zi, Yi Chou, Bing Yin and Ding Mao. Mating 60 times, so it is called 60 flowers. "Three Geng" is to meet three "Geng" characters, and it will be the first time on the third Geng Day. 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 uncertain change of Geng Day, the accommodation date is different every year.
Voltage is divided into initial voltage, intermediate voltage and final voltage, which is called three volts. The dog days are the hottest period of the year, because the nights are getting shorter and shorter, the days are getting longer and longer, and the sunshine is close to direct sunlight. But the summer solstice is not the hottest time, because at this time, a large part of the heat absorbed by the ground radiates at night. But it absorbs more heat and dissipates less heat every day, and it gets hotter every day. It will be the hottest when it reaches three volts in about 20 days.
The date of the dog days is from the summer solstice to the third Geng Day, which is the first lie, the fourth Geng Day to the fifth Geng Day is the middle lie, and the second Geng Day after the first Geng Day arrives in beginning of autumn is the last lie. Every Geng day is 65,438+00 days apart, and the number of mid-autumn festival days is not fixed. There are four Geng days between the summer solstice and the beginning of autumn, with 65,438+00 days in the middle, five Geng days and 20 days in the middle.
V means summer. From the summer solstice, the days begin to get shorter and the nights begin to get longer. There is a cold factor lurking in the middle of heat, so it is very scientific to name it "Fu".