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# When will autumn start in 2017

When will autumn start in 2017

4hw.org: the scorching heat is about to pass, and the autumn starts before the last volt of the three volts. However, there is still one volt after the autumn, and the temperature will not drop immediately. When will the autumn start in 2017? Let's have a look!

When does 2017 fall

Gregorian calendar: August 7, 2017

Lunar calendar: Ding Wei, month Ding Yin, Year ding you, lunar calendar (leap June 16)

Calculation method of the beginning of autumn

[Y*D+C]-L

Interpretation of the formula: y = the last two digits of the number of years, d = 0.2422, l = leap years, C = 7.5 in the 21st century, and 8.35 in the 20th century.

For example, the date of the beginning of autumn in 2088 = [88 & times; 0.2422 + 7.5] - [88 / 4] = 28-22 = 6, and August 6 is the beginning of autumn. Exception: calculation results in 2002 plus 1 day.

Autumn weather

There is a folk saying that "cool wind comes on the third day of the beginning of autumn", but most of the areas are still sunny and cloudy after the beginning of autumn. The rainfall is not obvious, and the temperature can still reach 31-33 ℃, the daily average temperature is still high, and the weather is still "sultry". However, as the temperature difference between morning and evening and noon becomes larger, people's somatosensory temperature in the morning and night will be lower than the previous days.

There will be autumn tiger weather after the beginning of autumn. Autumn tiger is a short-term hot weather after the beginning of autumn. It usually occurs at the turn of August and September and lasts for about 7-15 days. The reason for the formation of the autumn tiger is that the subtropical high in the Western Pacific Ocean, which controls China, gradually moves southward in autumn, but then moves northward. Under the control of the high, there are clear clouds, strong solar radiation and rising temperature. This kind of regenerative weather is called "old woman summer" in Europe and "Indian summer" in North America.

Because of China's vast territory, the performance of "autumn tiger" is slightly different. For example, the autumn tiger in South China comes later than that in the Yangtze River Basin, generally delaying 2-4 seasons. In addition, the control time of the autumn tiger varies from half a month to two months every year; sometimes the autumn Tiger comes, goes and looks back. Although the temperature of autumn tiger is high, the air is dry and sunny in general. It's not very hot sooner or later, so it won't be too hot to breathe.

Besides, autumn is the transitional season between summer and winter. In autumn, the direct point of the sun moves from 11 & deg; 32 & prime; n to 5 & deg; 57 & prime; n. With the sun's direct point moving southward, the daytime time is shortened, and the sunshine hours are decreasing day by day, and the light and heat given to the northern hemisphere are decreasing day by day. With the decrease of solar radiation, the heat available to the ground in the daytime is gradually reduced. As the night lengthens, the heat radiated from the earth's surface to space increases. As the heat absorbed by the ground is gradually less than the heat lost from the ground, the temperature begins to change from high to low.

Climatic characteristics of the beginning of autumn

It's autumn, but it's not autumn. The division of climate season should be based on the 'average temperature of climate', that is, the local average temperature for five consecutive days is below 22 ℃, which is the real autumn season. China is a vast country with different climates, but at this time most of the regions still do not enter the autumn climate. Moreover, the last day of the hot and rainy days is the third day after the beginning of autumn. Especially in the southern part of China, when the solar term is still summer and summer, the weather season is gradually gone and the temperature is even hotter. Therefore, the period from the beginning of autumn to before the equinox in Chinese medicine is called "long summer".

The earliest areas of Heilongjiang and Northern Xinjiang in autumn also begin to fall in the middle of August. In general years, the autumn wind in the capital Beijing starts to cool in early September. The autumn in Qinhuai area starts in the middle of September. In early October, the autumn wind blows to the front lines of Lishui, Zhejiang, Nanchang, Jiangxi and Hengyang, Hunan. In the first half of November, the information of autumn arrives at Leizhou Peninsula. When autumn arrives at Yaxian, Hainan, the "end of the earth" It's almost new year's day.