The summer solstice time information on books

The summer solstice is introduced

Every year on June 21 or 22, as the summer solstice.The summer solstice day, the sun the location of the ground to the extreme north of the year, almost direct the tropic of cancer (23 ° 26 '28' north latitude 44), in the northern hemisphere the day of the longest, and the longer the farther north.

The summer solstice is the northern hemisphere daylight on the longest day of the year, around the southern most from sunrise to sunset for fourteen hours.The highest summer solstice day although the longest day, the sun Angle, but not the hottest time of the year.Because heat near the earth's surface, then continues to savings, failed to achieve most.

As the saying goes, "hot in volts", the real heat weather is summer solstice and the beginning of autumn calculated basis points.About in the middle of July to mid-august, temperatures are highest, our country some areas of the highest temperature of 40 ℃ or so.

date

Formula: [Y * D + C] - L

Formula interpretation: Y = 2 after years, D = 0.2422, L = number of leap year, C = 21.37 in the 21st century, the 20th century = 22.20.

For example: in 2088, the summer solstice date = [88 x 0.2422 + 21.37] - [88/4] = 42-22 = 20, June 20, the summer solstice.

Exception: the calculation results and 1, 1928.

The climate characteristics

The convective weather

After the summer solstice is heated strongly on the ground, air convection, the afternoon to the evening often easy to form a thunder shower.This heat thunderstorm flash to disease, rainfall scope is small, people call "summer rain Tian Kan isolation".Tang dynasty poet liu yuxi, who skillfully metaphors appear this kind of weather, write "sunrise east west rain, tao is fine but it is sunny" the famous poem.Convective weather will bring heavy rain, not as beautiful as the poem describes, often with local disasters.

Heavy rain weather

Most of the time, during the period of "the summer solstice", in the middle and lower reaches of the Yangtze river, jianghuai basin meiyu, heavy rain weather, easy to form the floods, and even a threat to people's life and property, strengthen flood prevention work should be paid attention to.

Jianghuai meiyu

Midsummer season is "plum rains season in jianghuai area, it was jiangnan plum yellow ripeness stage, the air is very humid, cold, warm air mass convergence here, and form a trough, in wet weather.In such weather, implements the moldy, human also feel uncomfortable, some mosquito breeding fast, some intestinal bacteria are also easy to breed.At this time to pay attention to the health of drinking water, don't eat cold food, as far as possible to prevent the occurrence and spread of infectious diseases.

High temperature sauna

The summer solstice and winter solstice, reflect the four seasons solar terms.Astronomy, regulation, the beginning of the summer solstice for the northern hemisphere summer.After the summer solstice, although sun point moves toward the south, the northern hemisphere from day to day by day reduced, the night every day longer.But due to the heat of the sun radiation to the ground is still better than land for the air, so in after a period of time, the temperature will continue to rise, thus there are "the summer solstice but not hot".From the perspective of the data of 1951-2006, the history of many northern cities extremum appeared after the summer solstice.

The summer solstice origin

The summer solstice, is also called the old "summer festival", "the summer solstice festival".The summer solstice, old people by offering to pray for god away in a disaster.In the spring of the rites? Officer "load:" in summer to, to place Xiao."The zhou dynasty the summer solstice to god, to remove plague, famine and hunger deaths.

"The historical records? I book" records: "the summer solstice, the ground, all with a dance."Summer solstice as an ancient festival, song dynasty at the beginning on the day of the summer solstice, baiguan off for three days, the liao dynasty is "means the summer solstice festival, women in the color fan, distinctions to powder capsule heritage" (" liao history "), the qing dynasty is the pay for the summer solstice, when the sun, at the end of 2, of '3', in people daily life and the curse, quit their heads shaved, many taboos by..."(" qing jia record").

The summer solstice customs

Summer solstice day shandong generally eat's cold noodles, commonly known as through the water, have the proverb, "the summer solstice winter solstice dumplings noodles".Yantai laiyang around the summer solstice jianxin, huang county (now yantai egg) is new wheat cook, make up a delicate small children with wheat straw skimmer, in a time to the mouth for soup, both eat wheat, is a kind of game, a peasant the appeal of the life.

After the summer solstice third GengRi ChuFu, fourth GengRi ZhongFu, beginning of autumn after the first GengRi MoFu, general v.V day people loss of appetite, often than often, angular, vulgar "GuXia" means, in some places to eat raw cucumber and boiled in shandongeggsTo cure GuXia, RuFu morning eat eggs, do not eat any meat.

Guangdong area, people like cool tonic food in the summer heat, so residents generally clear fill cold soup in the summer, herbal tea, plum juice more traditional and very sweet food.And summer food more vinegar, less salt, ginger, garlic, smell less light, less to powder surface, lean meat, vegetables, melons, etc.

The summer solstice keeping in good health

In medicine theory, the summer solstice is the sun be the spirit of the most popular season, the season of preserve one's health care, on the one hand, to comply with the summer Yang excessiveness to the characteristics of outside, pay attention to protect the sun be the spirit;On the other hand, the summer solstice is also known as "Yin and Yang between die identify" of season, as the saying goes, "the summer solstice - Yin", that is to say, despite the hot weather, Yin qi has started to grow.

In this season, to conform to the changes in the natural ups and downs of Yin and Yang, general appropriate late to bed and early to rise, and lunch is used to make up for a lack of sleep at night.Frail elderly should be early to bed and early to rise, try to keep seven hours of sleep every day.Midsummer season, most people will have the whole body sleepiness symptoms of fatigue, and headache dizziness, severe cases can affect the daily life and work.Investigate its reason, the first is due to the time of the temperature is high, the body can heat dissipation through sweat, raise the body's huge loss of moisture, at this time if not keep hydrated, will make human body blood volume reduction, brain blood supply shortage, would, in turn, cause have a headache giddy.Is another cause of the headache dizziness, sweating body surface blood vessels expand, more blood will flow to the surface, the redistribution of blood can make low blood pressure, lower blood pressure, headache dizziness to occur.