Spring equinox, summer equinox, autumn equinox, winter equinox, when

The vernal equinox falls on March 20 or March 21 every year.

The summer solstice falls on June 21 or 22 every year.

The autumnal equinox falls on September 23 or 24 every year.

The winter solstice falls on December 21 or 22 every year.

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The summer solstice, in ancient times, was also called the "summer festival" and "summer solstice festival".

It is the twenty-four solar terms.

One of them, it is also a festival in the ancient folk "four times and eight festivals", since ancient times, there is a custom of worshipping gods and worshipping ancestors on the summer solstice, in order to pray for the elimination of disasters and a good year.

The vernal equinox, one of the 24 solar terms, is the fourth solar term of spring. The meaning of the vernal equinox is that the time of day is equal to the day and night, each of which is 12 hours; The second is that the spring equinox is in the three months of spring (beginning of spring to beginning of summer), and the spring is equally divided.

The autumnal equinox is the sixteenth of the 24 solar terms, and the sun reaches the ecliptic longitude on the day of the autumnal equinox.

At 180° (the autumnal equinox), it almost reaches the Earth's equator, and the length of day and night is equal around the world. In ancient times, there was a "spring festival day."

Autumn Moon", the autumn equinox was the traditional "Moon Festival". The Mid-Autumn Festival in 2019 is a traditional "moon festival".

The winter solstice, also known as the day solstice, the winter festival, the sub-year, 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.

In some coastal areas of southern China, there is a custom of worshipping ancestors on the winter solstice; In the northern region of China.

Every year on the winter solstice, there is a custom of eating dumplings.

The day of the vernal equinox is March 21, 2023.

The vernal equinox is one of the 24 solar terms and the fourth solar term of spring. Dou Zhi Mao, the yellow longitude of the sun reaches 0 °, and it is intersected on March 19-22 of the Gregorian calendar every year. The "dividend" of the vernal equinox has two meanings, one is the "equinoxical equinox", which is traditionally between the beginning of spring and the beginning of summer, and the vernal equinox day is in the middle of the two solar terms, which happens to equinox the spring; Another meaning is "equinox", on the day of the vernal equinox, the sun shines directly on the equator, and the day and night are of equal length, each for 12 hours.

The climate of the vernal equinox is characterized by warm and sunny weather.

Vernal equinox March 21 direct radiation: Equator.

Summer solstice, June 22 Direct shot: Tropic of Cancer (23°26'N).

Autumnal equinox September 23 direct rays: equator.

Winter solstice December 22 direct rays: Tropic of Capricorn (23°26's south latitude).

1. One of the 24 solar terms of the spring equinox, on March 20 or 21. On this day, the day and night are the same in both the northern and southern hemispheres.

2. The summer solstice is one of the 24 solar terms, which falls on June 21 or 22 of the Gregorian calendar every year. On the day of the summer solstice, when the sun reaches the northernmost point of the year, almost reaching the Tropic of Capricorn, the days in the Northern Hemisphere are the longest and get longer the further north they go.

3. Autumn equinox (autumnal equinox), the sixteenth solar term in the 24 solar terms of the lunar calendar, generally on September 22 or 23 every year. The climate in the south begins with this solar term before autumn. On this day, the sun reaches 180 degrees of ecliptic longitude and shines directly on the Earth's equator, so that the day is divided into 24 hours and night, 12 hours each; The global phenomenon of infinite diurnal and nocturnal.

After the autumnal equinox, the polar night range near the North Pole becomes larger, and the polar day range near the South Pole increases. "Seventy-two Candidate Explanations of the Lunar Order": "In August, the solution sees the spring equinox", "The divider is also flat, which is half of the ninety days, so it is called the divide." "It's half a minute, and it's the midpoint of the ninety days of autumn.

4. Winter solstice (English: winter solstice), also known as "winter festival", "winter celebration", one of the 24 solar terms in China.

1. One of the eight celestial solar terms, opposite to the summer solstice. The winter solstice begins when the sun reaches 270° ecliptic longitude, around December 22 of the Gregorian calendar. It is rumored that the winter solstice in the historical Zhou Dynasty was New Year's Day, which used to be a very lively day.

On the day of the winter solstice, the sun reaches the southernmost point of the year, almost reaching the Tropic of Capricorn (23°26 south latitude).'）。

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.

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Analysis: Vernal equinox March 21.

Summer solstice, June 21.

Autumnal equinox September 23.

Winter solstice, December 22.

This is due to the rotation of the earth which causes the seasons on the earth to change.

Twenty-four solar terms and seven words poem.

The earth revolves around the sun, and it takes a year to complete one circle.

The year is divided into twelve months, and twenty-four festivals are closely connected.

According to the Gregorian calendar, the two gases do not change every month.

The first half of the year was. Sixth, Ganyi, the second half of the year.

Eighth, Gan San. These are the festivals, and there is no more than a day or two.

The twenty-four verses are in order, and the following mantras are memorized:

In January, the small cold is followed by the big cold, and in February, the spring rain is connected;

The spring equinox is in March, and the rain in Qingming Valley is in April;

The beginning of summer and the small empty limbs are full in May, and the summer solstice is even planted in June;

July heat and small heat, the beginning of autumn and summer in August;

The white dew in September is followed by the autumn equinox, and the cold dew and frost fall in October;

The beginning of winter light snow November, heavy snow winter solstice to welcome the new year of bark branches.

Seize the season to busy production, planting and harvesting in time to ensure a bumper year.

Spring equinox March 21 Summer solstice June 21 Autumn equinox September 23 Winter solstice December 22 This is the twenty-four solar terms and seven words poem that causes the four seasons on the earth to change due to the rotation of the earth The earth revolves around the sun, and it is a year to complete a circle. The year is divided into twelve months, and twenty-four festivals are closely connected. According to the Gregorian calendar, the two gases do not change every month.

Every year around the 15th day of the second lunar month (the Gregorian calendar is about March 20-21) March 21, 2015 The second day of the second lunar month and the spring equinox.

On June 21 or 22 of the Gregorian calendar every year on June 22, 2015, the seventh day of the fifth month of the lunar calendar, the summer solstice.

The time is generally September 22 or 23 of each year, September 23, 2015, the 11th day of the eighth month of the lunar calendar, and the autumn equinox.

The time is between December 21 and 23 of the Gregorian calendar every year December 22, 2015 Lunar calendar, November 12, winter solstice.