The place with the longest summer solstice.

Mohe in the northernmost part of China is the longest day in China.

When the sun shines directly on the tropic of Capricorn, this day is called the winter solstice, that is, 65438+February 22. The days in the northern hemisphere are short and the nights are long, and the phenomenon of extreme night appears in the Arctic Circle. When the sun shines directly on the tropic of cancer, this day is called the summer solstice on June 22. The days in the northern hemisphere are long and the nights are short, and there are extreme days in the Arctic Circle.

Summer solstice is one of the earliest solar terms among the 24 solar terms. Every year on June 2 1 or 22 of Gregorian calendar, when the sun reaches 90 degrees of the yellow meridian, it is the summer solstice. "Solstice" means "extreme", and the summer solstice is also called "long days".

On the solstice of summer, the whole northern hemisphere ushered in the longest day. Astronomical experts calculate the length of a day in China according to the time from summer to sunrise and sunset: Mohe in the northernmost part of China is the longest place in China, and the length of a day is 16 hours and 56 minutes; Zengmu shoal at the southernmost tip of our territory is the place with the shortest day length in China, with a day length of 12 hours 16 minutes.

In the northern hemisphere, if you 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 you reach the area north of 66 34' north latitude, you can see the phenomenon of "white night" and people can enjoy the sunshine for 24 hours.

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.

In the northernmost part of the world, there will even be extreme days in the Arctic, that is, there is no night. After the vernal equinox, there will be extreme days near the North Pole, and then the range of extreme days will become larger and larger; It reaches its maximum on the solstice in summer, and its boundary extends to the Arctic Circle.

The summer solstice is the 10 of the 24 solar terms. On the day of summer solstice, the position where the sun shines directly on the ground reaches the northernmost part of the year, almost directly on the tropic of cancer. At this time, the daylight hours in all parts of the northern hemisphere reach the longest in the whole year. For the Tropic of Cancer and its northern region, the summer solstice is also the highest day at noon in a year.

The solstice in summer is the turning point of the sun's northward movement. After the summer solstice, the direct point of the sun began to move south from the Tropic of Cancer, and the days in the northern hemisphere began to shorten gradually. For China, which is located to the north of the Tropic of Cancer, after the summer solstice, the height of the noon sun begins to decrease day by day.