Why should a year be divided into spring, summer, autumn and winter?

When the sun shines directly on the Tropic of Capricorn, the Northern Hemisphere gets more solar heat, and the days are longer than the nights, so the temperature in the Northern Hemisphere is the highest of the year, which is summer; At this time, the sun is obliquely shining in the southern hemisphere, which gets less solar heat, and the nights are longer than the day, so the southern hemisphere is in the coldest season of the year - winter. As the Earth revolves around the Sun for another half revolution, the Sun's direct point shifts from the Tropic of Cancer to the Tropic of Capricorn, and the Sun's heat in the Northern Hemisphere gradually decreases, from summer to autumn and then to winter. In the Southern Hemisphere, it runs from winter to spring and then to summer.

<>However, the Earth's orbit around the Sun is not perfect, so summers in the Southern Hemisphere are slightly hotter than summers in the Northern Hemisphere and slightly colder in winters. The rotation of our Earth around the Sun is combined with the rotation of our Earth. We all know that our earth revolves around the sun once a year, and the earth rotates once a day, and this is where the most amazing place comes!

Our earth revolves around the sun. The plane of our Earth's orbit around the Sun and the plane of our Earth's rotation are not in the same plane, they form an amazing angle, which is called the intersection angle. If this is confusing, you can imagine that the plane of the Earth's motion around the Sun is indeed horizontal, while the Earth's rotation is tilted.

The angle between the two sides is about 23 degrees.

Then there will be a hail trail of miraculous phenomena, the sun will have a regular change in the direct point of the earth, because the earth has been tilted, the earth changes from day to day, and the rotation of the earth around the sun is also carried out at the same time. In the process of rotation, the plane perpendicular to the center of the earth and the axis of rotation is called the equatorial plane, and the orbit of rotation is called the ecliptic plane.

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Mainly according to the change of climate, as well as the situation in terms of temperature, plus changes in meteorology, and finally formed spring, summer, autumn and winter.

It is directly related to the revolution of the earth. The angle of the sun changes constantly, and the seasons are created throughout the year.

It is because the earth has some autobiographies, so that it is not the same as being irradiated by the sun, and there are spring, summer, autumn and winter.

It is determined by the temperature and the length of darkness, and the climate and length of time are different throughout the year, and the temperature is very high in summer.

What are the causes of the four seasons?

There are four divisions for spring, summer, autumn and winter in a year, which are astronomical division, meteorological division, ancient division, and lunar division.

1. Astronomical division: March 21 is the beginning of spring, and the spring equinox to the summer solstice is spring. The summer solstice on June 21 is the beginning of the summer burning bridge, and the summer solstice to autumn equinox is the summer evaporation.

September 21 is the beginning of autumn equinox, and autumn is autumn from the autumn equinox to the winter solstice. The winter solstice on December 21 is the beginning of winter, and the winter solstice to spring equinox is winter.

2. Meteorological division method: In the meteorological department, the solar calendar takes March to May as spring, June to August as summer, September to November as autumn, December to February of the following year as winter, and often takes the month as the representative month of winter, spring, summer and autumn.

3. Ancient division: the beginning of spring (February 4 or 5) is the beginning of spring, the beginning of summer (May 5 or 6) is the beginning of summer, the beginning of autumn (August 7 or 8) is the beginning of autumn, and the beginning of winter (November 8 or 9) is the beginning of winter.

4. Lunar division method: It is customary to take January to March of the lunar calendar every year as spring, April to June as summer, July to September as autumn, and October to December as winter. The first day of the first lunar month is the first day of the year, and it is also the first day of spring.

In ancient times, the beginning of spring, summer, autumn and winter were the beginning of the four seasons; There are also those with the summer calendar from January to March as spring, April to June as summer, July to September as autumn, and October to December as winter.

In Western astronomy, the spring equinox, summer solstice, autumn equinox, and winter solstice are the beginning of each season.

In modern times, the solar calendar generally uses March to May as spring, June to August as summer, September to November as autumn, and December to February of the following year as winter. Chinese folk usually use climate, especially temperature, as the standard for dividing the four seasons. The climate varies from place to place, so the length of the four seasons varies, sometimes even very different.

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In the Northern Hemisphere, the Gregorian calendar runs from the beginning of February to the beginning of May, while in the Southern Hemisphere (e.g., Australia) it is from September to November.

Spring, also known as spring, is the first season of the four seasons, referring to this or Liang Lichun to the beginning of summer, including the beginning of spring, rain, stunning, vernal equinox, Qingming, and valley rain. It is the season of revival. Meteorologically, spring begins with an average temperature of 10 or above for 5 consecutive days.

The spring climate is warm and moderate, with rain in most parts of Chinese mainland, and everything is full of vitality, and the climate is changeable, warm and cold.

Spring March --- May.

Summer: June --- August.

Autumn September --- November.

Summer, December --- February are different from year to year.

The division of the four seasons.

The division of the four seasons is different from that of the West in our country. China's method of dividing the four seasons emphasizes the astronomical characteristics of the seasons: summer is the season with the longest days and the highest noon sun in a year; Winter is the season of the year when the days are shortest and the midday sun is lowest; Spring and autumn are the transitional seasons between winter and summer, with even day and night, and the midday sun is at a moderate height.

Specifically, it takes the "four li" (beginning of spring, beginning of summer, beginning of autumn, and beginning of winter) in the twenty-four qi as the beginning and end of the four seasons, and the two equinoxes and two solstices as the four middle (see the division of the four seasons).

Spring: the beginning of spring is the starting point, the spring equinox is the midpoint, and the beginning of summer is the end point;

Summer: the beginning of summer is the starting point, the summer solstice is the midpoint, and the beginning of autumn is the end point;

Autumn: The beginning of autumn is the starting point, the autumn equinox is the midpoint, and the beginning of winter is the end point;

Winter: The beginning of winter is the starting point, the winter solstice is the midpoint, and the beginning of spring is the end point.

Such four seasons have obvious astronomical significance, but do not correspond to the actual climatic conditions. For example, the beginning of spring and the beginning of autumn are the beginning of spring and autumn, while the climate is still midwinter and midsummer; The summer and winter solstices are the midpoints between summer and winter, but they are not the hottest and coldest times of the year.

The 24 qi is a summary of the experience of the working people of China in conducting astronomy, meteorological and phenological observations for a long time, and is a great scientific achievement in ancient China. Its division is characterized by both astronomical and climatic seasons. Its dichotomy and quadrangle (collectively known as the eight stanzas) express the astronomical seasons; The rain, sting, Qingming, Guyu, Xiaoman, mangzhong, Xiaoxia, Daxia, Chuxia, white dew, frost, light, snow, Xiaohan, Xiaohan and Dahan obviously indicate the climate and agricultural season.

Among them, the great heat and the great cold represent the hottest and coldest seasons of the year, respectively. The Great Heat is the second air after the summer solstice, that is, the month after the summer solstice, which is roughly equivalent to the middle volt in the traditional "three dog days"; The Great Cold is the second air after the winter solstice, that is, one month after the winter solstice, which is similar to the traditional "Sanjiu". Therefore, there is a folk proverb that "cold is in Sanjiu, and heat is in the middle".

The astronomical season and the climatic season are clearly different and closely combined.