The symbol of the northern hemisphere entering midsummer

On the summer solstice every year, the latitude of the direct point of the sun in the northern hemisphere reaches the maximum, and the height of the sun can reach 90. At this time, it is the midsummer in the northern hemisphere, with long days and short nights in the northern hemisphere, extreme days in the Arctic Circle (including the Arctic Circle), winter in the southern hemisphere, and extreme nights in the Antarctic Circle.

Since then, the direct point of the sun has gradually moved southward, and it has always been moving in a cycle between two latitude circle cities near 23 26' north latitude and 23 26' south latitude. Therefore, these two latitude circle are called Tropic of Cancer and Tropic of Capricorn respectively.

Extended data:

In ancient China, the summer solstice was divided into three phases: "One phase of staghorn dissolution; Second, wait for cicadas to start singing; Three waiting for Pinellia ternata. " Although elk and deer belong to the same family, the ancients believed that they belonged to yin and yang. Deer's horns face forward, so they belong to Yang.

On the summer solstice, yin qi is born and yang qi begins to decline, so the positive antlers begin to fall off. However, the elk is cloudy, so it falls off at the corner of the winter solstice; After the summer solstice, male cicadas flapped their wings and sang because of the feeling of yin qi; Pinellia ternata is a shade-loving herb, so it is named because it was born in a swamp or paddy field in midsummer. It can be seen that in the hot midsummer, some yin-loving creatures began to appear, while positive creatures began to decline.

References:

Baidu Encyclopedia-Summer Solstice