When does autumn start? When does autumn start?

The lunar calendar begins in July and the solar calendar begins in September.

There are a total of 6 solar terms in autumn, which are the beginning of autumn, the summer heat, the white dew, the autumn equinox, the cold dew, and the frost.

Autumn temperatures drop gradually, but generally slower than winter. Due to the difference in wet and dry conditions, different regions will have cold and rainy weather conditions, or dry and cool weather conditions. In the colder late autumn, due to the large temperature difference between day and night, the water vapor transpired during the day will condense at night, either as dew or as frost.

In autumn, the direct point of the sun gradually moves southward from the northern hemisphere, and after the autumnal equinox, it crosses the equator and the sun shines directly on the southern hemisphere. From the Northern Hemisphere, the angle of the Sun gradually decreases, and the gap between the length of day and night decreases. At the autumnal equinox, the day and night are equal in length.

In autumn, the distance between the Earth and the Sun gradually increases. From the plane of the zodiac, the Sun is placed on the background of Leo, Virgo, and Libra.

The beginning of autumn is the 13th of the 24 solar terms. On August 7 or 8 every year, the sun reaches 135° ecliptic longitude as the beginning of autumn. "Autumn"It means that the summer goes to cool down, which means the beginning of autumn. However, in the beginning of autumn, the weather in the Jianghuai area is still very hot.

According to the standard of dividing the season according to the average temperature, the average temperature must be below 22 for 5 days to be considered autumn, according to this standard, the Jianghuai region generally enters autumn in mid to late September. After the beginning of autumn, although the heat is difficult to get rid of for a while, there are still"Autumn Tiger"But the general trend is that the weather is getting cooler. The diurnal difference in temperature is gradually noticeable, often during the day it is hot and the night is cooler.

The meaning of autumn is actually the meaning of the crops that are about to ripen. After the beginning of autumn, in most areas of southern China, late rice jointing and booting, cotton cracked boll and flocculated; Medium rice and summer maize entered the stage of grain filling and maturity. In the eastern and western parts of South China, the task of fighting drought and flood control is still very arduous.

In South China after the beginning of autumn, although the season is still in the middle of summer, but"Ten days of the beginning of autumn are all over the ground", a gold"Autumn"It's coming.

Starting from the beginning of autumn, this year's exact start of autumn is 5:31 on August 8.

The beginning of autumn is the 13th of the 24 solar terms, which generally falls on August 7 or 8, and the situation of the beginning of autumn on the 8th generally occurs once every 4 years.

Signs of the beginning of autumn:

1. In terms of months, the lunar calendar from July to September is from the beginning of autumn to the beginning of winter, the solar calendar is from September to November, and the astronomical calendar is the period from the autumn equinox to the winter solstice. Autumn in China begins with the beginning of autumn, passes through early autumn, mid-autumn and late autumn, and ends at the beginning of winter.

2. From a meteorological point of view, the autumn in the north temperate zone is on August 23 (summer heat) and November 20 (light snow); Autumn in the southern temperate zone falls on February 19 (Northern Hemisphere rain) and May 21 (Northern Hemisphere Lesser Man).

3. In terms of temperature, the 10 22 period is spring and autumn.

Autumn, also known as autumn, is the third season of the four seasons of the year, the transition season from summer to winter, September to November in the northern hemisphere, March to May in the southern hemisphere, and astronomical from the autumn equinox to the winter solstice.

Meteorologists study phenology based on the following: after a hot day, the five-day average temperature is below 22 degrees Celsius, and autumn is considered to be autumn, and autumn ends when it is below 10 degrees.

Autumn beauty:

1. When the autumn wind blows, the leaves on the trees are like butterflies slowly, slowly falling to the ground, laying a golden carpet on the earth.

2. The trees in the woods are real! There are yellow leaves, red leaves, and green leaves, and the trees are flying around in the air, like butterflies flying in the air.

3. The autumn girl came to the park, she woke up the osmanthus, the autumn chrysanthemum, the fragrance of the osmanthus made passers-by stop going back and forth, and the beauty of the autumn chrysanthemum made everyone intoxicated.

4. The grass on the playground is no longer as green as spring, but all yellow, deaf and pulling their heads, and there is a kind of beauty when they look at it from afar.

5. After the autumn rains, the fruits in the orchard are all wearing a pearl necklace. Shaking the branches with his hands, the pearl necklaces all fell off in unison.

Autumn begins on the day of the beginning of autumn and ends on the day of the beginning of winter, autumn refers to the lunar calendar from July to September, the beginning of autumn, is the 13th solar term in the 24 solar terms, and the festival is intersected on August 7-9 of the Gregorian calendar every year, and its beginning and end are the result of the movement of celestial bodies.

The beginning of autumn does not mean that the hot weather is over, the beginning of autumn is still in the hot period, not yet out of the heat, the second solar term of autumn (the heat) is only out of the heat, and the weather is still very hot during the early autumn. The watershed between heat and coolness is not in the beginning of autumn. The most noticeable change in autumn is when the leaves of the grass and trees change from lush green to yellow.