Why are there four seasons in a year: spring, summer, autumn and winter?

The height of the sun changes periodically, resulting in periodic direct and oblique rays. In the process of the earth's revolution around the sun, the earth's axis is always inclined to the orbital plane at an angle of 66 degrees and 33 minutes. Due to the tilt of the Earth's axis, the height of the Sun at different points on the Earth's surface is different when the Earth is in orbit.

When the altitude angle of the sun is large, the sun shines directly, and the heat is concentrated, as if it is facing a furnace; Moreover, the path of the sun in the sky is long, the sunshine hours are long, the days are long and the nights are short, and the temperature is bound to be high, which is summer. On the contrary, when the altitude angle of the sun is small, the sunlight hits the ground obliquely, and the heat is dispersed, which is equivalent to being obliquely facing the furnace; Moreover, the path of the sun in the sky is short, the sunshine hours are short, the days are short and the nights are long, and the temperature is low; From summer to winter, the height of the sun changes from high to low, forming the four seasons. There are different criteria for dividing the four seasons:

Astronomy, the spring equinox, summer solstice, autumn equinox, and winter solstice are the beginning of each season; In ancient China, the beginning of spring and the beginning of summer. The beginning of autumn and the beginning of winter are the beginning of each season; There is also a lunar calendar among the people.

Spring, April, May and June are spring, April, May and June are summer, July, August and September are autumn, and October and October.

1. December is the division of winter; In modern times, the solar month is generally used as spring, summer as summer, and December and the following year as winter. These simple divisions divide the year into four seasons of roughly equal length. Although it is convenient for memorization, it does not reflect the actual change of seasons.

Climatology uses a large number of meteorological data, integrates astronomical geography and other factors that affect climate, and divides the weather periods with similar weather and climatic characteristics into four seasons, which is called the natural weather seasonal division method. The length of the four seasons varies from time to time and from place to place.

Seasonal change is first an astronomical phenomenon and then a climatic phenomenon. It is very closely related to human activities. The seasons are usually referred to as the four seasons.

Due to the existence of the yellow-red angle and the fact that the north end of the earth always points to the vicinity of the North Star when the earth rotates, the direct point of the sun moves north and south with the rotation of the earth, which causes the change of the height of the sun at noon in winter and the change of the length of day and night.

The so-called spring, summer, autumn and winter are strictly speaking only a phenomenon that occurs in the mid-latitudes of the northern and southern hemispheres. The division of the four seasons Spring, summer, autumn and winter are very important for human production and life, and the division is based on different factors, the length of the four seasons, the start and end time are not the same, and the four seasons are roughly divided into the following methods.

1 Astronomical Seasons These are the seasons based on the height of the sun and the length of day and night. Summer is the most daylight of the year.

Long, the season when the sun is at its highest, the opposite is true in winter, and spring and autumn are the transitional seasons. It does not take into account the cold and heat conditions of the actual climate. 2 The four seasons traditionally divided into four seasons in China are the first of the four seasons, which meet the astronomical conditions, but are also quite different from the actual climatic conditions.

3 The Four Seasons in Western Countries It is customary to take "two equinoxes" and "two solstices" as the first of the four seasons, which are divided according to the position of the sun on the ecliptic, and in some areas are basically the same as the actual climate. In terms of time, it is about a month and a half later than the traditional four seasons in China. 4 The Four Seasons of Climatology According to the months of the solar calendar, March and May are designated as spring; 6 August is designated as summer; 9 November is designated as autumn; 12 February is set for winter.

It is relatively close to the four seasons in Western countries. 5 Seasonal Temperature In order to harmonize the four seasons of spring, summer, autumn and winter with phenological phenomena such as "peach blossoms, cicadas begin to sing, geese fly south, and frost condensation", the meteorological department takes the actual temperature as the basis for dividing the four seasons. Geographical distribution of the four seasons1 Tropical rainforest climate zone, summer all year round, the average annual temperature is around 28.

2 In the savannah climate zone, the dry and wet seasons alternate obviously, taking the northern hemisphere as an example, from November to April of the following year, the trade winds control and prevail in the tropical continental air mass, forming a dry season with drought and little rainfall; From May to October, the equatorial depression is controlled and the equatorial air mass prevails, forming a hot and rainy wet season. 3. The tropical monsoon climate zone is divided into two seasons of dry and rainy seasons, from June to September every year, the summer monsoon comes, forming a high temperature and rainy rainy season; From October to May, the winter monsoon arrives and precipitation decreases significantly, creating a dry season.

4 Due to the high latitude of the polar regions, it is very cold throughout the year, and both are winter. 5 The temperate region has four distinct seasons, with warm spring, hot summer, cool autumn and cold winter in a year. However, due to the fact that the temperate zone spans many latitudes, from low latitudes to high latitudes, the height of the sun and the length of day and night vary greatly, and the length of the four seasons is also different.

From the long summer and short winter at low latitudes to the long winters and short summers at high latitudes.

There are four seasons in a year: spring, summer, autumn, winter, and winter. These four seasons represent the laws of nature.

Spring is warm, summer is hot, autumn is cool, winter is cold. Spring is the time when all things rise, summer is when all things begin to grow, autumn when everything begins to harvest, and winter is when all things begin to hide. This constitutes the law of spring, summer, autumn and winter storage of all things in nature.

The earth revolves, giving rise to the four seasons. This is shown in the figure below.

Because of the revolution of the earth, the driver is formed. In spring and summer, the sun shines on your area, and in autumn and winter, the sun does not shine on your area.

In spring, everything recovers, and spring flowers bloom. In summer, the heat is unbearable, and the vegetation is lush. Autumn is fruitful, and autumn is high and cool. In winter, it is snowy and vegan.

Of course, these 4 seasons have a lot of meanings, and there will be a lot of meanings, spring refers to spring, full of air, summer refers to summer, it will make you very hot, autumn is the harvest season, and winter will make you feel particularly cold.

Hello, this is obviously the change of seasons, and in the case of changes, there is the origin of these four seasons.

The Earth revolves around the Sun, and the Earth's axis of rotation has an inclination of 23 degrees and 27 minutes.

Solar radiation is the main source of energy in the Earth's surface. The distribution of solar radiation in the upper sphere of the atmosphere is determined by the astronomical position of the Earth, which is called astronomical radiation. The climate that is determined by astronomical radiation is called astrocal climate.

Astronomical climate reflects the basic contours of the spatial distribution and temporal variation of global climate.

Solar radiation changes regularly with the seasons, forming the four seasons.

In addition to the changes in the sun itself, the astronomical radiation energy is mainly determined by the distance between the sun and the earth, the angle of solar altitude and the length of the day. While the Northern Hemisphere receives direct sunlight in the middle of summer, the Southern Hemisphere faces the oblique rays of the sun and is in the middle of winter. Spring in the Northern Hemisphere corresponds to autumn in the Southern Hemisphere, and both hemispheres receive the same amount of sunshine.

This is the origin of the four seasons.

It's because the earth revolves. The rotation of the earth causes the sun to shine directly between the tropics throughout the year, and there is a change in heat.

When the sun is close, the heat is high, that is, summer. Winter is the opposite, while spring and autumn are its transitional periods. In fact, these four seasons are more obvious in temperate countries like ours, and the four seasons are not obvious in cold and tropical countries, only two seasons.

The gradual change of the seasons is not uniform across the globe, with summer in the northern hemisphere and winter in the southern hemisphere; The Northern Hemisphere changes from warm to cold, and the Southern Hemisphere changes from cold to hot. The length of day and night and the height of the sun change periodically in different seasons.

What are the causes of the four seasons?

As we all know, the year is divided into 4 seasons, namely spring, summer, autumn and winter. These 4 seasons divide the time of year, and the temperature and cycle of each season are also different. The seasons are divided by the earth's sunlight, so why are there four seasons of spring, summer, autumn and winter?

Let me give you a detailed answer to your questions.

On our planet there are tropical, boreal and temperate zones. The tropics only have the rainy season and the dry season, while the cold zone is ice and snow all year round, and only the temperate zone has four distinct seasons of spring, summer, autumn and winter.

The four seasons are divided into spring and summer according to the rotation of the earth, and autumn and winter are divided into autumn and winter in December, the shortest sunshine time, according to the rotation of the earth. And according to the change of temperature, it is divided into four seasons.