Where does the sun rise on the summer solstice?

Summer solstice was also called "summer season" and "summer solstice festival" in ancient times. The ancients said: "The days are long, the shadows are short and extremely extreme, so it is called the summer solstice." When the sun moves to the longitude of the Yellow River at 90 degrees, it is the intersection of the summer solstice, usually on June 2 1-22 in the Gregorian calendar. 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. For the Tropic of Cancer and its northern area, the summer solstice is also the highest day of the year at noon.

The summer solstice is not only one of the 24 solar terms, but also a festival in the ancient folk "four seasons and eight festivals". Since ancient times, there has been a custom of offering sacrifices to gods and ancestors to the Japanese. "Heaven and earth are the foundation of life; Ancestors are the foundation of mankind. " Heaven and earth are the foundation of life, ancestors are the foundation of life, and ancestor worship is the custom of inheriting filial piety. In addition, there are folk customs such as "avoiding summer and hiding" and "clearing the field" from summer to day.

The summer solstice is the tenth of the twenty-four solar terms. "Twenty-four solar terms" was originally determined by bucket handle of Beidou, which means noon, that is, the summer solstice. The current "twenty-four solar terms" are divided by the method of "constant gas", that is, each solar term corresponds to a certain position reached by the earth every time it runs 15 on the ecliptic, and the summer solstice is when the sun runs to 90 degrees on the ecliptic. Seen from the ecliptic plane, the sun is on the background of Taurus, Gemini and Cancer. The summer solstice is the northernmost day of the sun in a year, the zenith of the sun's northbound journey, the longest sunshine day in the northern hemisphere, and a day with more time than night. However, the long days in various places show a decreasing trend from north to south. This is because the days are long and the nights are short caused by the tilt of the earth's rotation axis, and the closer it is to the two levels, the more obvious it is. On the day of the summer solstice, except the south pole of the Antarctic circle and the polar night area, the sunrise direction in all parts of the earth starts from the northeast and sets in the northwest. The summer solstice is the northernmost day of the sun in a year and the limit of the sun's northward movement. On this day, the northern hemisphere gets the most solar radiation, almost twice as much as the southern hemisphere. After the summer solstice, the Tropic of Cancer and its northern region, the midday sun altitude angle also began to decrease.

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 and regions are all areas where the sun is in the middle of the sky, the sun shadow is the shortest, the day is the longest and the night is the shortest, which is what the ancients said, "the day is long, the shadow is short, and even the 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, I went back, and the point of direct sunlight began to move south from the Tropic of Cancer (23 26' north latitude), and it became daylight in the northern hemisphere.