Is the summer solstice the longest day of the day?

On the day of summer solstice, the sun shines almost directly on the Tropic of Cancer, which is the longest day in a year in the northern hemisphere. The farther north the day is, the wonder of "standing without shadow" will appear on the Tropic of Cancer.

Zhao Zhi Heng, a member of Chinese Astronomical Society and director of Tianjin Astronomical Society, said that "solstice" means "extreme", and the summer solstice is also called "long days". After the summer solstice, the direct position of the sun gradually moves southward, and the days in the northern hemisphere gradually shorten.

The phenomenon of shadowless pole erection in the summer of solstice

On the day of summer solstice, the sun shines almost directly on the Tropic of Cancer, and absolutely (almost) directly at noon, and there will be a spectacle of "standing without a shadow" near the Tropic of Cancer.

The phenomenon of "standing without shadow" only exists in the area south of the Tropic of Cancer, and the sun shines vertically on the ground twice a year. There are five signs of the Tropic of Cancer in Chinese mainland, which are located in Shantou, Conghua and Fengkai in Guangdong, Guiping in Guangxi and Mojiang in Yunnan.

Zhanjiang, Maoming, Yangjiang, Yunfu, Zhaoqing, Jiangmen, Foshan, Zhongshan, Zhuhai, Shenzhen, Dongguan, Huizhou and Shanwei, which are located south of the Tropic of Cancer in Guangdong Province, can be seen standing without a shadow twice a year.

People's Daily Online -2 1 "Summer solstice" this month: the longest day of the year in the northern hemisphere.