The four seasons refer to the four alternating seasons in a year, which are divided into spring, summer, autumn and winter.

Introduction to seasonal distinctions:

Custom distinctions:

Chinese folk customs use the lunar calendar to distinguish, with January, February, and March as spring; April, May, June is summer; July, August, and September are autumn; October, November, and December are winter.

Astronomical seasons:

The astronomical seasons reflect the seasonal changes in the height of the sun throughout the year. Since the solar radiation reaching the ground is affected by the ground and sea and land, its thermal effect lags behind the solar radiation effect by about one month, so March, April and May of the solar calendar are often regarded as spring; June, July and August as summer; September, October and October November is autumn; December, January and February are winter. The dates of the astronomical seasons are fixed and easy to remember, but they cannot reflect regional characteristics and differences.

Extended information

Introduction to the four seasons:

Refers to the four alternating seasons in a year, namely spring, summer, autumn and winter. In astronomy, the seasons are determined by the position of the Earth in its orbit around the sun. When the earth is at different positions in its orbit at different times of the year, various places on the earth receive different amounts of sunlight and receive different amounts of heat from the sun, resulting in seasonal changes and differences in heat and cold.

The four seasons on Earth are not only periodic changes in temperature, but also periodic changes in the length of day and night and the height of the sun. It affects or determines the movement rhythm of many things in the earth's environment, especially biological adaptation.

Geographical Phenomenon

The Earth's orbit around the sun is elliptical and has an angle with the plane of its rotation. When the earth is at different positions in its orbit at different times of the year, various places on the earth receive different amounts of sunlight and receive different amounts of heat from the sun. Therefore, there are seasonal changes and changes in hot and cold conditions. difference.

In terms of climate, the four seasons are distinguished by temperature. In the northern hemisphere, spring is generally from March to May, summer is from June to August, autumn is from September to November, and winter is from December to February. In the Southern Hemisphere, the seasons are exactly opposite to those in the Northern Hemisphere. When it is summer in the Southern Hemisphere, it is winter in the Northern Hemisphere; when it is winter in the Southern Hemisphere, it is summer in the Northern Hemisphere. There are no clear boundaries between the seasons, and the transition from season to season is gradual.

Reference: Four Seasons—Baidu Encyclopedia