The arrival of summer solstice means the arrival of hot summer. On the solstice of summer, the sun shines directly on the Tropic of Cancer, and at this time, the daylight time in all parts of the northern hemisphere reaches the longest in the whole year.
On the summer solstice, the direct position of the sun on the ground reaches the northernmost point of the year, almost directly to the Tropic of Cancer, which passes through Yunnan, Guangxi, Guangdong and Taiwan Province provinces in China from west to east. These four provinces have the sun in the middle of the sky, the shortest shadow, the longest day and the shortest night, which is what the ancients said: "The days are long, the shadows are short and even extreme." At the same time, for the Tropic of Cancer and its northern areas, the summer solstice is also the highest day at noon in a year. At this time, the southern hemisphere is in the middle of winter. For example, the daily length of Haikou in Hainan is a little more than 13 hours, Hangzhou is 14 hours, Beijing is about 15 hours, and Mohe in Heilongjiang can reach 17 hours. North of the Arctic Circle, the sun is above the horizon all day, which is the widest day in the northern hemisphere.
The solstice in summer is the turning point of the sun. After this day, it went back, and the direct sunlight point began to move south from the Tropic of Cancer (23 26' north latitude), and the days in the northern hemisphere became shorter day by day. For the Tropic of Cancer (23 26' north latitude) and its northern area, after the summer solstice, the noon sun height began to decrease day by day. Summer is the longest sunshine season in the northern hemisphere, and there will be extreme days in the Arctic Circle, and the sun will not set all day. 1-3 In July, the earth will move to the farthest point of its orbit. The summer solstice is the day when the sun is in the highest position in the sky. There is a folk saying that "the summer solstice is born in the shade".
The difference between summer solstice and summer solstice:
The solstice in summer is the longest day and the shortest night in the northern hemisphere. On the day of the summer solstice, except for the polar regions of the Arctic and Antarctic circles, the sunrise direction in all parts of the earth starts from the northeast and sets in the northwest.
Take Beijing as an example. In summer solstice, dawn begins at 2:42 am and gets up at 4:45 am. At night 19:46, 2 1:49 it was completely dark. The complete darkness lasted only about 5 hours, and the time when the sun was above the horizon was 15 hours. If we continue to go north, the night will be further shortened. In Nordic cities such as Stockholm, Helsinki and Oslo, the midnight sky is still bright, so you can read books under the night sky. When we reach the area north of 66.4 north latitude, we can see the midnight sun, which we think is a miracle. People there can enjoy sunbathing 24 hours a day.
Around the summer solstice, the earth is located near the perihelion, and its running speed is slightly slower, resulting in the sun spending 8 days more in the northern hemisphere than in the southern hemisphere in a year, so the summer in the northern hemisphere is slightly longer.
The annual summer solstice is not necessarily the same day. But they all appeared around June 22, when the sun's altitude angle was just on the tropic of cancer, and the sun's altitude angle was the largest in the northern hemisphere, so this day was called the summer solstice, also called the summer solstice.