During the winter solstice, there will be no shadow on the vertical pole of Shantou, Guangdong

Regarding the change of natural rhythm, the following statement is wrong: during the winter solstice, there will be no shadow on the vertical pole in Shantou, Guangdong Province.

A shadowless pole is a natural sight, that is, an object standing upright on the ground has no shadow. At noon from the summer solstice, the Tropic of Cancer is absolutely (nearly) direct when the sun is direct, and there will be a short-term "no shadow" phenomenon in the Tropic of Cancer area.

The phenomenon of "standing without a shadow" only exists in the area between the Tropic of Cancer and the Tropic of Capricorn, and the sun shines vertically on the ground twice a year.

On the day of the summer solstice solar term, the sun is almost directly on the Tropic of Cancer, which is the highest latitude that direct sunlight can reach in the northern hemisphere in a year. At this time, the days are the longest and the nights are the shortest in the northern hemisphere.

At noon from the summer solstice, it is absolutely (almost) direct, and there will be a short-term phenomenon of "standing without a shadow" around the Tropic of Cancer. There is no shadow on the pole, and the sun shines directly on the Tropic of Cancer, marking the real arrival of summer and hot weather and climate near the Tropic of Cancer.

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. Astronomical experts said that there is a "peephole" at the sign of the Tropic of Cancer in China, so the public can verify whether the sun shines vertically on the ground at noon from summer to Sunday.

Other people who live near the Tropic of Cancer and its south can also set up a pole in the sun from summer to noon a few days before and after, and observe the process of "immediate effect" turning into "no trace".

The observation time was June 20, 20021day. The summer solstice occurs at 7: 09 on June 2 1 Sunday. The observation time of Guangdong shadowless pole is: Shantou, Guangdong 15:27 02:00, Conghua, Guangdong12: 27: 52; Guangdongkai 12: 35: 49.

Twenty-four solar terms are the product of ancient farming civilization. People have discovered the changes of the four seasons in nature, and gradually realize that the changes of climate and phenology in a year are also regular. In different seasons, the orientation of the Big Dipper is different from that of bucket handle.