《Zhuomeng automobile | Summer solstice, white day by day, everything in the publicity of the sun savage growth.》
Summer solstice is the 10th solar term of the 24 solar terms. Bucket finger noon; Sun longitude 90°; It is celebrated on June 20-22 in the Gregorian calendar. On this day, the sun reaches the northernmost point of the year, almost directly over the Tropic of Cancer, and the northern Hemisphere has the longest daylight hours of the year. For areas north of the Tropic of Cancer, the summer solstice is also the day of the year when the midday sun is at its highest altitude.
The summer solstice is the turning point for the sun to travel north. After the summer solstice, the direct sun begins to move south from the Tropic of Cancer, and the days begin to get shorter in the northern hemisphere. For China located north of the Tropic of Cancer, after the summer solstice, the height of the midday sun begins to decrease day by day; For areas south of the Tropic of Cancer in China, the noon sun’s altitude returns to the south after the summer solstice, and the sun begins to lower daily after the summer solstice.
High temperature, high humidity, and occasional thunderstorms are the characteristics of the weather after the summer solstice. The summer solstice in the middle of the summer position, that is, the noon position, the afternoon is Yang; Although the summer solstice is more sunny and has the longest day, it is not necessarily the hottest day of the year, so the heat near the surface is still accumulating and does not reach the maximum time. Summer solstice is one of the 24 solar terms, in ancient times is also a festival in the folk “four hours eight”, since ancient times there is a custom of worship in the summer solstice. In addition, after the summer solstice, people generally eat Qingbuliang soup, herbal tea, sour plum soup and so on to avoid heat.
Historical origin
The “24 Solar Terms” is the product of ancient farming civilization. People discovered the four seasons of nature, and gradually realized that the change of climate and phenology in a year also has rules to follow. Observing the Big Dipper at dusk every day, people found that in different seasons, the orientation of the “Big Dipper” and the direction of the bucket handle are different. So the Big Dipper has long been a star sign indicating the seasons. As “Guanzi · Circulation” wrote in: “Bucket handle east refers to the world is spring; Bucket handle south refers to the world all summer; Bucket handle west refers to the world is autumn; It is winter all over the world.”
The 24 solar terms are specific seasons in the calendar that represent changes in natural rhythms and establish the “construction of December.” At the age of four, there are three months in spring, summer, autumn and winter, two solar terms each month, and each solar term has its own unique meaning. According to Chen Xiling’s “Obey the Constitution” explains [summer solstice] : “The sun is north, the sun is long, and the sun is short, so it is called the summer solstice.” The most important, the most important.” Hence the name of the summer solstice. At noon on this summer solstice, the sun is absolutely (nearly) direct, and the Tropic of Cancer region will appear briefly “no shadow” phenomenon, “no shadow” phenomenon only occurs in areas south of the Tropic of Cancer.
Summer solstice is the tenth solar term of the “24 Solar Terms”. On this day, the sun reaches the northernmost point of the year, almost directly over the Tropic of Cancer (23°26′ N), and the length of daylight is the longest in the Northern Hemisphere, and the higher the latitude, the longer the day. This is due to the “long day and short night effect” caused by the tilt of the Earth’s rotation axis, which is more obvious the closer it is to the poles. For example, the day in Haikou City in Hainan Province is a little more than 13 hours, in Hangzhou it is 14 hours, in Beijing it is 15 hours, and in Mohe City in Heilongjiang it is more than 17 hours. North of the Arctic Circle, the sun stays above the horizon all day, making it the most extreme day of the year in the Northern Hemisphere.
At the same time, for areas north of the Tropic of Cancer, the summer solstice is also the day of the year when the midday sun is the highest in the region. The summer solstice is the northernmost day of the year, when the northern hemisphere receives nearly twice as much solar radiation as the southern hemisphere.
The summer solstice is the turning point of the sun’s northward journey. After this day, the sun will “reverse”, and the point of direct sunlight begins to move south from the Tropic of Cancer. For areas north of the Tropic of Cancer in China, after the summer solstice, the noon sun begins to decrease daily; For regions south of the Tropic of Cancer in China, after the summer solstice, the noon sun’s altitude does not begin to decrease day by day until it passes directly through the southward sun. Every region south of the Tropic of Cancer in the Northern hemisphere is shot vertically into the earth by the sun twice a year.
After the summer solstice, the days begin to get shorter across the northern Hemisphere. There is a folk saying that “after eating the summer solstice noodles, one day is short.” Wei Yingwu, a Chinese poet in the Tang Dynasty, also wrote in his book North Pond of Summer Solstice that “the day has been cloudy, and the night has been leaking since then.”
At the same time, after the arrival of the summer solstice, the night sky has gradually changed into the summer sky.
Air temperature precipitation
After the summer solstice, although the direct point of the sun began to gradually move south from the Tropic of Cancer, the northern hemisphere day began to gradually become shorter, but because the heat of the sun radiation to the ground is still more than the ground to the air, so in the following period of time, the temperature will continue to rise, so there is a “summer solstice but not hot”. As the saying goes, “heat in the three Fu”, the real hot weather, about mid-July to mid-August in the Gregorian calendar.
On this day, the sun reaches the northernmost point of the year, and the northern Hemisphere has the longest daylight hours of the year. During this period, the temperature in most parts of China is higher, the sunshine is sufficient, the crops grow quickly, and the physiological and ecological water needs are more. [24] After the summer solstice, the ground is subjected to intense heat, the air convection is strong, and thundershowers often form from afternoon to evening. This kind of hot thunderstorm comes and goes quickly, and the rainfall range is small, and people say that “summer rain separates the field.”
The “summer solstice” is the beginning of midsummer. Although it is not yet the hottest day of the year, it is not far away from “fall”. From the “summer solstice”, after three “Geng days”, it will enter the hottest dog days of the year, the so-called “summer solstice three heptyl number of first volt”. High temperature, high humidity, and occasional thunderstorms are the characteristics of the weather after the summer solstice.
◆ “No shadow”
On the summer solstice, the sun is almost directly over the Tropic of Cancer, and at noon it is absolutely (nearly) direct, and the area near the Tropic of Cancer will appear “immediately invisible”. The phenomenon is only found south of the Tropic of Cancer, where the sun hits the ground twice a year.
Summer solstice north and south to eat noodles
Since ancient times, there is a saying in some parts of China, “Winter solstice dumplings and summer solstice noodles”, and eating noodles on summer solstice is an important custom in many areas. Because the new wheat has appeared in the summer solstice, eating noodles in the summer solstice also has a new meaning.
Summer solstice
The summer solstice, like the winter solstice, is an important folk festival in China. It was called “Summer Festival” and “Summer Solstice Festival” in ancient times. Before the Qing Dynasty, the summer solstice had a national holiday, and went home to drink with relatives to avoid the summer heat, known as the summer holiday. In the Song Dynasty, “Wenchang Miscella” recorded: “The summer solstice begins, officials have three days off.”
A drop of summer solstice rain is worth thousands of dollars.
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Post time: Jun-21-2024