Tomorrow is the 24 solar terms summer solstice, so do you know what the solar terms mean? This solar term focuses on understanding the meaning of 'to'. To, extremely also. The longest day of the summer. And after the summer solstice, the weather began to get hot, so we must do a good job of heatstroke prevention.
Date of summer solstice 2018:
Thursday, June 21, 2018 (May 8, 1898)
The summer solstice is one of the 24 solar terms, on June 21 or 22 of the Gregorian calendar. On the day of the summer solstice, the Sun runs to 90 degrees (in Gemini) of the Yellow longitude. The sun reaches the northernmost point of the year, almost directly on the Tropic of cancer. At this time, the northern hemisphere has the longest sunshine time. In Beijing, daylight hours can be as long as 15 hours. On this day, the northern hemisphere gets the most sunlight, nearly twice as much as the southern hemisphere.
Astronomers say the summer solstice is the turning point of the sun. After that day, it will turn around and the direct point will start to move south. After the summer solstice, the number of daylight hours in the northern hemisphere decreased day by day. At the same time, after the arrival of the summer solstice, the night sky stars gradually become the summer sky.
The summer solstice is the earliest solar term among the 24 solar terms. In the seventh century B.C., the sun and shadow were measured in the guise, and the summer solstice was determined. The summer solstice begins on June 21 (or 22) and ends on July 7 (or 8). According to the copy of "abide by the constitution" it is said that "the sun reaches to the north, the day is long, and the shadow is short, so it is called the summer solstice. To the extreme, too. On the day of summer solstice, the position of direct sunlight on the ground reaches the northernmost end of the year, almost directly on the Tropic of cancer (23 & deg; 26 \ '), and the day in the northern hemisphere reaches the longest, and the longer the day is northward. For example, Haikou in Hainan Province is about 13 hours long, Hangzhou is about 14 hours, Beijing is about 15 hours, and Mohe in Heilongjiang Province is over 17 hours. After the summer solstice, the sun's direct position on the ground gradually moved to the south, and the days in the northern hemisphere gradually shortened. There is a saying among the people that eating noodles after summer is a short line in a day. At this time, the southern hemisphere is in the middle of winter.
In ancient China, the summer solstice was divided into three periods: 'the first one was antlers; the second one was cicadas; the third one was Pinellia. Although elk and deer belong to the same family, the ancients believed that both belong to Yin and Yang. The antlers of deer are antediluvian, so they belong to Yang. On the summer solstice, Yin Qi was born and Yang Qi began to decline, so the positive antlers began to fall off. Because of its Yin, the elk only falls off on the winter solstice; the male cicadas sing after the summer solstice because they feel Yin; Pinellia is a kind of herb that likes Yin, so it gets its name because it was born in the swamp or paddy field in midsummer. Thus, in the hot midsummer, some Yin loving creatures began to appear, while the positive ones began to decline.
Chinese folk divide the 15 days after the summer solstice into three 'hours', the first three days, the middle five days and the last seven days. During this period, the temperature in most areas of China is higher, the sunshine is sufficient, the crops grow rapidly, and the physiological and ecological water demand is more. At this time, the precipitation has a great impact on agricultural production, there is a saying that the summer solstice rain point is worth thousands of gold. In general years, the precipitation in the middle and lower reaches of the Yangtze River and the Huanghuai region can generally meet the requirements of crop growth. In the book of Jingchu, it is said: 'there will be three rains in June. The Tian family thinks it's sweet, and they celebrate each other in the city. It can be seen that more than 1000 years ago, people had a clear understanding of the characteristics of this rainfall.