What other ways are there to divide the four seasons? What is the formation process of the four seasons?

What other ways are there to divide the four seasons?

first

The traditional four-time division method takes four of the 24 solar terms as the starting point and two point two to one as the midpoint. For example, starting from beginning of spring, the longitude of the solar ecliptic is 3 15, the midpoint of the vernal equinox is the midpoint, the long summer is the end point, and the longitude of the solar ecliptic becomes 45? The sun moves 90 on the ecliptic. This is a traditional and commonly used method.

second

Astronomical classification (that is, western classification) emphasizes the climatic significance of the four seasons, starting from two to four. These four seasons are one and a half months later than the traditional four seasons in China.

third

In order to accurately reflect the actual climate situation in various places, the climate method, that is, the classification method of modern scholar Zhang Baokun, is often used to divide the four seasons by the average climate temperature. It is also stipulated that the average temperature is greater than or equal to 22℃ in summer, less than or equal to 10℃ in winter and 10-22℃ in spring or autumn.

How to divide 12 months in a year into four seasons? How to divide 12 months in a year into four seasons?

? Four seasons form:

There is an included angle (23 26') between the earth's rotation axis and the earth's orbit plane around the sun (ecliptic plane). Therefore, when the earth revolves around the sun, the position of the sun directly facing the earth will change from 23 26' south latitude to 23 26' north latitude (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 (about 65438+February 22nd) and the summer solstice (about 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). ? 2 1 day or so).

? Characteristics of the four seasons

1. Spring is the first season of the year. The ice and snow began to melt and everything revived. In this warm and cold season, everything has just begun, everything is so fresh and full of vitality, and flowers are everywhere.

2. Summer is the second season of the year, with scorching sun and high sacrifice enthusiasm. Heavy rains often mess up the whole city. After a while, the sun evaporated the rain, making people feel groggy all day.

Autumn is the third season of the year. It is breezy and crisp. Autumn is always cool, which makes people feel very comfortable. When the autumn wind blows, there is a feeling of rustling. The dry air has lost its suffocating feeling in summer. A deep breath of clean and cool air is refreshing.

Winter is the last season of the year, with thousands of miles of ice and heavy snow. Every winter comes, everyone is so cold that they want to hide under the covers. Flowers, trees, fish, insects, birds and animals have all disappeared.