Do you know what four seasons are?

Four seasons: Four seasons are spring, summer, autumn and winter, and each season lasts for three months. In spring, the temperature warms up and everything recovers; In summer, the weather is hot and the fruit is ripe; In autumn, the temperature turns cool and the crops mature; In winter, the weather is cold and sometimes it snows.

Not only the climate in different parts of the earth is very different, but also the climate in different seasons in the same area is different.

Spring: Spring is one of the four seasons in a year. In China, spring begins in the beginning of spring (February 2-5) and ends in the long summer (May 5-7).

Autumn: In China, autumn begins in early autumn and ends in early winter.

How are the four seasons formed? There is an included angle (23 26') between the earth's rotation axis and the earth's revolution plane around the sun (ecliptic plane). Therefore, when the earth revolves around the sun, the position of the direct sunlight on the earth will change from 23 26' south latitude to 23 26' north latitude, that is, the tropic of cancer. When the sun shines directly, the heat and temperature on the earth's surface are high, which is summer; On the contrary, when the sun is tilted, the heat gained on the earth's surface is low, which is winter.

When the sun shines directly into the northern hemisphere, it is summer in the northern hemisphere and winter in the southern hemisphere; On the contrary, when the sun shines directly into the southern hemisphere, it is summer in the southern hemisphere and winter in the northern hemisphere. When the sun shines directly on the Tropic of Cancer, it is the winter solstice (around 65438+February 22nd) and the summer solstice (around June 22nd). When the sun shines directly at the equator, it is the vernal equinox (about March 2 1) and the autumnal equinox (about September 2 1).

The direct sunlight area is located between the Tropic of Cancer and the Tropic of Cancer, so the sun in this area is always almost direct, so the energy obtained from the sun is high in a year, which leads to the high temperature in this area and little change in a year. This area is called the tropics. In the tropics, there is no change in the four seasons, all of which are summer.

Usually refers to all seasons of the year, mainly in the temperate zone, that is, the area between the Tropic of Cancer and the Tropic of Cancer to the Antarctic Circle and the Arctic Circle. The Antarctic Circle refers to the southernmost latitude line that the sun can illuminate when it hits the Tropic of Cancer, that is, 66 34' south latitude (latitude and latitude of the Tropic of Cancer are complementary). Similarly, the Arctic Circle is located at 66 34' north latitude. In the polar circle, there will be extreme days and nights. Obviously, in summer in the northern hemisphere, there are polar days in the Arctic Circle and polar nights in the Antarctic Circle. On the contrary, when it is summer in the southern hemisphere, the extreme night phenomenon appears in the Arctic Circle and the extreme day phenomenon appears in the Antarctic Circle.

Season: season refers to dividing a year into four parts on average (referring to the four seasons of spring, summer, autumn and winter). The commonly known "season" is to divide a year into four parts on average, and the order is spring, summer, autumn and winter.

A year can be divided into four quarters, and each quarter lasts for three months.

The first quarter: 65438+1October-March

Second quarter: April-June

The third quarter: July-September

Section 4: 65438+ 10-65438+February

In fact, the strict division should be: (according to the latitude of China)

The first quarter: March-May (spring)

The second quarter: June-August (summer)

Section 3: September-165438+ 10 (autumn)

Section 4:12-February (winter)

Summary:

Obviously, the four seasons we are familiar with, the time of spring, summer, autumn and winter, are inconsistent with the time of quarterly division.