What are midsummer and summer heat?

The first is a long summer, and the second is a solstice summer.

Midsummer is connected with summer: after long summer, it is full, after full, it is rough, and summer is connected with summer.

Chang Xia said that saying goodbye to spring is the beginning of summer. Spring comes and summer grows, autumn harvests and winter storage, and in the long summer, everything is thriving. Because China has a vast territory and a large span from north to south, natural rhythms vary from place to place.

Summer solstice was also called "Summer Festival" 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 of the Gregorian calendar.

Extended data

The long summer in 24 solar terms is also the beginning of Mitsuki. "The bucket refers to the southeast, and the dimension is long in summer. Everything grows here, hence the name Long Summer. " "Summer" in long summer means "big", and "long summer" means that plants sown in spring have grown upright at this time. Spring, long summer, autumn harvest and winter storage, summer is the best season for many crops to grow vigorously.

In the long summer, everything is thriving. Because China has a vast territory and a large span from north to south, natural rhythms vary from place to place. In the long summer season, only the area south of Fuzhou-Nanling line in China is the real summer of "the trees are dark and the summer is long, and the balcony reflects into the pond"; And some areas in the northeast and northwest have just entered spring.

According to the classification standard of modern climatology (climate average temperature) in China, the daily average temperature rises steadily to above 22℃, starting in summer.

The summer solstice is the tenth of the twenty-four solar terms. The "Twenty-four solar terms" were originally determined by the bucket handle direction 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.