When is spring, summer, autumn and winter to be specific, thank you, teachers

The first classification method: China's traditional method of dividing the four seasons is to take the four of the 24 solar terms as the starting point of the four seasons, and the equinox and the two solstices as the midpoint. For example, the beginning of spring is the starting point, the ecliptic longitude of the sun is 315°, the spring equinox is the midpoint, the beginning of summer is the end point, the ecliptic longitude of the sun becomes 45°, and the sun runs 90° on the ecliptic.

This is a traditional, common method

The second classification: the astronomical classification (i.e., the Western classification) The division of the four seasons emphasizes the climatic significance of the four seasons, and takes the equinoxes and solstices as the starting point of the four seasons, such as the spring equinox in spring and the summer solstice as the ending point. These four seasons are one and a half months later than the four seasons traditionally divided in our country.

The third classification method: in order to accurately reflect the actual climatic conditions of various places, the four seasons are often divided into four seasons, that is, the modern scholar Zhang Baokun's classification method, which uses the average temperature to divide the four seasons. And stipulates:

The period when the average temperature is greater than or equal to 22 is summer, the period less than or equal to 10 is winter, and the period between 10 and 22 is spring or autumn. According to this criterion, the seasons in the mid-latitudes are consistent with the climate, and the temperature changes in spring, summer, autumn and winter in the low-latitudes and near the poles are very insignificant. At the same time, in the mid-latitudes, the length of each season is also different.

These are the four seasons of the climate. For example, Beijing has 55 days in spring, 103 days in summer, 50 days in autumn and 157 days in winter. This method can be combined with the specific climate and agriculture of various places, so it is used more

The fourth classification method: climate statistics, because January is generally the coldest month, therefore, spring, March, April, May Summer, June, July, August Autumn, September, October, November Winter, December, January, February This classification of the four seasons is more suitable for temperate regions with four distinct seasons

1. Spring:"Stupid" means that everything begins to grow at this season.

2. Xia:False" means that all things begin to grow rapidly during this season.

3. Autumn:"just" means that all things are ripe when this season comes.

4. Winter:The meaning of "end" refers to the end of all things in this season.

Four Seasons: Four seasons refer to the four seasons that alternate in a year, namely spring, summer, autumn, and winter, with three months each. The four seasons of the year are formed because the earth revolves around the sun.

Due to the existence of the yellow-red angle, the annual change of the direct point of the sun moving back and forth between the north and south latitudes of the earth is 23°26, which causes the seasonal change of the height of the sun at noon and the seasonal change of the length of day and night, resulting in the seasonal change of the amount of solar energy obtained in various places, so that the change of the four seasons is formed.

The vernal equinox is held on March 19 or 20 or 21 or 22 every year. The summer solstice is celebrated on June 20, 21, or 22 every year. The autumnal equinox is held on September 22 or 23 or 24 every year. The winter solstice is celebrated on December 21 or 22 or 23 of the Gregorian calendar every year.

1. The vernal equinox is the "twenty-four solar terms."

The fourth solar term. "The vernal equinox, yin and yang are half and half. Therefore, the day and night are even, and the cold and heat are even". The word "fen" shows the boundary between day and night, cold and summer. At this time, the sun is ecliptic.

is 0 degrees, and the position of the Sun is above the equator.

2. The summer solstice is the tenth solar term of the "24 solar terms". The "24 solar terms" were originally determined by the direction of the bucket handle of the Beidou, and the bucket handle started from the north of the east (Gen position), and turned around through the south, west and north, which was a cycle, which was called a "year".

3. The autumn equinox is the sixteenth of the 24 solar terms, and the time is generally September 22 and 24 of the Gregorian calendar every year. On the day of the autumnal equinox, the sun reaches 180° of ecliptic longitude (the autumnal equinox) and almost directly hits the Earth's equator, with day and night being equal in length all over the world.

4. The winter solstice is the 22nd solar term of the "24 solar terms", the yellow longitude of the sun reaches 270 °, and the festival is handed over on December 21 and 23 of the Gregorian calendar every year. The winter solstice marks the height of the sun in the Northern Hemisphere.

The minimum and the shortest daylight hours, but the temperature on the winter solstice is not the lowest.

Spring equinox (between March 20 and March 21 in the Gregorian calendar), summer solstice (between June 21 and June 22 in the Gregorian calendar), autumn equinox (between September 23 and September 24 in the Gregorian calendar), and winter solstice (between December 21 and December 23 in the Gregorian calendar).

Equinox. Every year around March 20 of the Gregorian calendar, the sun is at 0° of yellow longitude (the vernal equinox), which is the vernal equinox. On this day, the sun shines almost directly at the Earth's equator, and the day and night are almost equal in length around the world (not taking into account the refraction of sunlight in the atmosphere and the shadow of morning and dusk).

After the vernal equinox, the direct point of the sun continues to move from the equator to the northern hemisphere, and the days and nights begin to be longer and shorter in various parts of the northern hemisphere, that is, the days are longer than the nights in a day. Throughout the Southern Hemisphere, the days began to be shorter and the nights longer, i.e., the days were shorter than the nights during the day. Therefore, the vernal equinox is also called the ascending equinox.

Summer solstice. The summer solstice is the earliest of the 24 solar terms to be determined. In the seventh century B.C., the ancestors used Tugui to measure the shadow of the sun and determined the summer solstice.

According to the "Manuscript of the Constitution": "The sun is in the north, the day is long, and the shadow is short, so it is called the summer solstice." The most solitary, the extreme.

On the day of the summer solstice, the sun reaches the northernmost point of the year, almost reaching the Tropic of Cancer (23°26 N'), is the longest day of the year in the Northern Hemisphere, and the higher the latitude, the longer the day.

Autumnal equinox. In my country's ancient book "Spring and Autumn Dew, Yin and Yang in and Out", it is said: "For the autumn equinox, yin and yang are half of each other, so the day and night are even, and the cold and summer are even."

The "points" of the autumnal equinox means "half". On this day, the Sun reaches 180 degrees of ecliptic longitude and shines directly at the Earth's equator, so the 24-hour day and night are evenly divided into 12 hours each in most parts of the world.

Winter solstice. The winter solstice (December 21 and 23 of the Gregorian calendar), the cold winter is coming. The winter solstice is one of the specific seasons of the 24 solar terms that represents the change of seasons and is based on the change in the position of the Earth on the ecliptic, which is the Earth's orbit around the Sun.

On the day of the winter solstice, the sun travels to 270° of ecliptic longitude (the point of the winter solstice), and the position of the sun directly hitting the ground reaches the southernmost point of the year, and the sun almost directly hits the Tropic of Capricorn (also known as the winter solstice line), and the sunlight is most inclined to the northern hemisphere.

The vernal equinox is the midpoint of the ninety days of spring. The annual Gregorian calendar is about March 20 and 21, and the summer solstice is June 21 or 22 of the Gregorian calendar every year, the autumn equinox, and the lunar time is generally September 23 or 24 every year. The winter solstice is on December 21 or 22 or 23 of the Gregorian calendar every year.

The winter solstice, also known as the winter festival, the sub-year, the long solstice festival, etc., has both natural and humanistic connotations, which is not only an important solar term in the 24 solar terms, but also a traditional Chinese folk festival. The winter solstice, the yellow longitude of the sun reaches 270 °, and the festival is held on December 21-23 of the Gregorian calendar every year.

Every year around September 23, when the sun reaches 180 degrees of yellow longitude, it enters the "autumn equinox" solar term. The "autumn equinox" and the "spring equinox" are the earliest solar terms established by the ancients. Press "Spring and Autumn Dew, Yin and Yang in and Out of the Upper and Lower Chapters" cloud:

The autumn equinox is accompanied by yin and yang, so the day and night are even, and the cold and summer are even. "The meaning of "autumn equinox".

At the time of the autumn equinox, most parts of our country have entered the cool autumn, and the cold air from the south meets the warm and humid air that gradually decays, producing precipitation again and again, and the temperature also drops again and again.

The vernal equinox is the midpoint of the ninety days of spring. Every year in the Gregorian calendar, it is about March 20 and 21, when the sun is at 0° of yellow longitude (vernal equinox).

March 21, 2015 Lunar calendar, the second day of the second lunar month, the spring equinox.

March 20, 2016 Lunar calendar, February 12, spring equinox.

The summer solstice is, on June 21 or 22 of the Gregorian calendar every year. On the summer solstice, the sun travels to 90 degrees of ecliptic longitude (in the constellation Gemini), and the sun reaches the northernmost point of the year, almost directly to the Tropic of Capricorn, when the Northern Hemisphere has the longest hours of sunshine.

June 22, 2015 Lunar calendar, the seventh day of the fifth month, the summer solstice.

June 21, 2016 Lunar calendar, May 17, summer solstice.

The autumn equinox is generally celebrated on September 23 or 24 every year. The climate in the south begins with this solar term before autumn. First, the sun reaches 180 degrees of ecliptic longitude on this day and hits the earth's equator, so the day is divided into 24 hours and night, 12 hours each; The global phenomenon of infinite diurnal and nocturnal.

September 23, 2015 Lunar Calendar August 11 Autumn Equinox.

September 22, 2016 Lunar Calendar August 22 Autumn Equinox.

The winter solstice is an important solar term in the Chinese lunar calendar, and it is also a traditional festival of the Chinese nation. It is one of the earliest of the 24 solar terms, which falls between December 21 and 23 of the Gregorian calendar every year.

December 22, 2015 Lunar Calendar, November 12, Winter Solstice.

December 21, 2016 Lunar Calendar, November 23, Winter Solstice.

Spring equinox - 3 21 Summer solstice - 6 22 Autumn equinox - 9 23 Winter solstice - 12 22

On the summer solstice, when the sun reaches the northernmost point of the year, almost straight to the Tropic of Capricorn, the Northern Hemisphere has the longest daylight hours of the year. For the Tropic of Cancer and the regions north of it, the summer solstice is also the day of the year when the sun is at its highest at noon. On this day, the Northern Hemisphere receives the most solar radiation, nearly twice as much as the Southern Hemisphere.

At the winter solstice, it is the opposite of the summer solstice. The sun reaches the southernmost point of the year, almost straight to the Tropic of Capricorn, when the Southern Hemisphere has the longest daylight hours of the year. For the Tropic of Capricorn and the regions south of it, the winter solstice is also the day of the year when the sun is at its highest at noon.

The vernal equinox is on March 21 or 22.

Summer solstice, June 22 or 23.

The autumnal equinox is on September 23 or 24.

Winter solstice: December 22 or 23.

From the winter solstice, the days get longer and longer.

From the summer solstice, the days get shorter and shorter.

Because the winter solstice is the shortest day of the year.

The summer solstice is the longest day of the year.

The vernal and autumnal equinoxes are the same length of day and night across the globe.

Note: The above answers are for the Northern Hemisphere.

Probably. Vernal equinox: March 21.

Autumnal equinox: September 22.

Summer solstice: June 21.

Winter solstice: December 22.

It's been too long to forget.

To be sure, the first two sentences are a bit of a minor problem.

It should be from the winter solstice, and the days start to get longer, but the winter solstice is the time when the day is the shortest, and the earth reaches perihelion.

From the summer solstice, the days begin to get shorter, but the summer solstice is the time when the days are the longest, when the earth reaches aphelion.

The vernal equinox is March 21-22.

Summer solstice, June 22-23.

The autumnal equinox is September 23-24.

Winter solstice, December 22-23.

From the vernal equinox, the days get longer and longer.

From the autumnal equinox, the days get shorter and shorter.

From the vernal equinox it gets longer and longer.

From the autumnal equinox it gets shorter and shorter.

Vernal equinox: March 23.

Autumnal equinox: September 23.

Summer solstice: June 21.

Winter solstice: December 21.

Spring: Everything recovers, everything has a chance Because of the infiltration, the season of the year lies in spring, thriving (beginning).

Summer: Green trees and shade, everything is equal Because the victory of the year lies in summer, and all things compete for favor (through) Autumn: The harvest is abundant, and everything is ripe Because the harvest of the year is in autumn, it is festive Cong Jijing (fruit).

Winter: Everything is to be stored, everything is ready to be sent Because the storage of a year lies in winter, and everything sleeps (memory) Spring, Summer, Autumn Winter: Like a person's life, from birth (spring) to growth (summer) to our family (autumn), and the other half to old age (winter), this is the pursuit of human beings throughout their lives It is also the law of all things, and everything begins like this

Spring is generally 3 4 .In May, there are 92 days.

Summer is generally 67.In August, there are 92 days.

Autumn is generally a month with 91 days.

Winter is generally 12In the month of the following year, there are about days.

Spring, summer, autumn and winter are determined by the position of the earth in the orbit, take the autumn equinox as an example, when the earth moves to a certain position, the sun is at an intersection of the ecliptic plane and the celestial equatorial plane, at this time the sun directly hits the equator, at this time the earth runs to the autumn equinox, and the date is what we call the beginning of autumn.

It stands to reason that each time the earth rotates is equal, and the date of each time it reaches the autumn equinox is equal, but because human beings stipulate that the time of a year and the time it takes for the earth to actually make a revolution are not equal, the earth passes through the autumnal equinox twice and is equivalent to a revolution, our calendar shows that 365 days have passed, but the actual time of the earth is days, in order to eliminate the error, human beings have introduced the method of leap years, a leap year every four years, and a leap year is 366 days, so this situation will occur.

Season, Month, Solar Terms, Sun Reaches Ecliptic Longitude, First Wait, Second Wait, Third Wait, Spring, Mengchun, Lichun, 315°, East Wind Thaw, Stinging Worms, Fish on Ice, February 3-5.

Rain 330° Peach Blossom Cang Gengming Eagle into dove February 18-20.

Mid-spring, stinging, 345°, otter sacrifice fish, wild geese, grass and trees sprouting, March 5-7.

Vernal equinox 0° Xuanniao to Lei Nai vocalizes the beginning of electricity.

March 20-21.

Ji Chun Qing Ming 15° Tong Shihua voles turn into ducks and rainbows are seen on April 4-6.

Valley rain 30° Ping Shisheng Song dove flicks its feathers The hoopoe fell on the mulberry on April 19-21.

Xia Mengxia Lixia 45° Mole Song Earthworm out Wang Gua Sheng, May 5-7.

Small full 60° bitter herb show grass dies small summer solstice.

May 20-22.

Midsummer, Miscanthus species, 75°, praying mantis, the beginning of the song, the tongue is silent, June 5-7.

Summer to 90° Antlers deer antlers are born in half summer.

June 21-22.

Season summer summer heat 105° warm wind to cricket dwelling eagle is to study July 6-8.

The heat is 120°, the decaying grass turns into fireflies, and the soil moistens the summer, and the heavy rain runs from July 22 to 24.

Autumn Mengqiu Liqiu 135° Cool breeze to white dew cold cicadas chirp August 7-9.

Heat: 150°, Eagle is a sacrifice bird, Heaven and Earth Shisu, Henaideng August 22-24.

Mid-autumn white dew 165° Hong Geese come to the Xuanniao return to the flock of birds to raise their shyness, September 7-9.

Autumn equinox 180° Thunder began to collect the sound of stinging insects and insects The water began to dry up on September 22-24.

Autumn cold dew 195 ° Hong goose guests finch attack the water for the clam chrysanthemum has yellow flowers, October 8-9.

Frost falls 210°, jackals are sacrificial beasts, plants and trees fall yellow, stinging insects are salty, October 23-24.

Winter Mengdong Beginning of Winter 225° Water Begins to Freeze Pheasants Entering the Water is a mirage on November 7-8.

Light snow 240° rainbow hidden, the weather rose and became closed, and the winter became winter from November 22 to 23, and the earth atmosphere fell.

Midwinter, heavy snow, 255°, birds do not sing, tigers start to cross, Li Tingsheng December 6-8.

Winter solstice 270° earthworm knot, elk horn solution, water spring movement, December 21-23.

Season winter, small cold, 285°, wild goose northward, magpie first nest, pheasant first nest, January 5-7.

The cold 300° chicken first milk bird is very sick, and the water is strong and the belly is strong, January 20-21.