What is the most accurate division of the four seasons of the year?

The Four Seasons are divided according to the length of day and night and the change in the height of the sun. In the division of the seasons, the apparent position of the sun on the ecliptic is used as the basis, and the equinox, solstice, or four days are used as the boundary. However, the boundaries used by Eastern and Western countries to divide the seasons are not identical.

The first taxonomy:

The traditional method of dividing the four seasons in China is to take the four of the 24 solar terms as the starting point of the four seasons, and the equinoxes and solstices as the midpoint. For example, the beginning of spring is the starting point, the ecliptic longitude of the sun is 315°, the spring equinox is the midpoint, the beginning of summer is the end point, the ecliptic longitude of the sun becomes 45°, and the sun runs 90° on the ecliptic. This is a traditional, common method.

The second taxonomy:

The astronomical classification (i.e., the Western taxonomy) divides the four seasons more on the climatic significance of the four seasons, and takes the equinoxes and solstices as the starting point of the four seasons, such as the spring equinox in spring and the summer solstice as the ending point. These four seasons are one and a half months later than the four seasons traditionally divided in our country.

The third taxonomy:

In order to accurately reflect the actual climatic conditions of various places, the four seasons are divided by climatic methods, that is, the classification method of modern scholar Zhang Baokun, and the average temperature is used to divide the four seasons. It also stipulates that the period when the average temperature is greater than or equal to 22 is summer, the period less than or equal to 10 is winter, and the period between 10 and 22 is spring or autumn.

According to this criterion, the seasons in the mid-latitudes are consistent with the climate, and the temperature changes in spring, summer, autumn and winter in the low-latitudes and near the poles are very insignificant. At the same time, in the mid-latitudes, the length of each season is also different. These are the four seasons of the climate.

For example, Beijing has 55 days in spring, 103 days in summer, 50 days in autumn and 157 days in winter. This method can be combined with the specific climate and agriculture of various places, so it is used more.

Fourth Taxonomy:

Climatological statistics, because January is generally the coldest month, therefore, spring, March, April, May, summer, June, July, August autumn, September, October, November winter, December, January, February This four-season classification method is more suitable for temperate regions with four distinct seasons.

Welcome, hope it helps.

It is divided according to the beginning of spring, the beginning of summer, the beginning of autumn, and the beginning of winter in the 24 solar terms. Alternatively, spring is from February to April, summer is from May to July, autumn is from August to October, and winter is from November to January.

The month is spring. The month is summer.

The month is autumn. for winter.

The correct criteria for dividing the four seasons of the year:The spring equinox, summer solstice, autumn equinox, and winter solstice are the beginning of the four seasons; Meteorological division: March to May is spring, June to August is summer, September to November is autumn, December to February is winter; Solar term division method:

The beginning of spring, summer, autumn and winter is the beginning of the four seasons.

The four seasons on Earth are first and foremost an astronomical phenomenon, not only periodic changes in temperature, but also periodic changes in the length of day and night and the height of the sun. Of course, the length of day and night and the change in the height of the sun at noon determine the change in temperature before the change of the period.

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

The characteristics of the seasons of spring, summer, autumn and winter are as follows:1. Spring: The weather will become warmer and warmer, everything will grow and recover, and this season is a rainy season.

2. Summer: The weather is particularly hot, and the trees are the best growing season, and there are bursts of cicadas in the ears.

3. Autumn: Autumn is high and cool, the leaves turn yellow, and with the arrival of late autumn, all the leaves fall.

4. Winter: The days will be shorter and the nights will be longer, and this season will be dominated by snowfall and little rainfall.

The year is divided into 4 seasons, namely spring, summer, autumn, and winter. January 20 is the vernal equinox, which is the beginning of spring. June 21 is the summer solstice, that is, the beginning of summer.

September 23 is the autumnal equinox, which is the beginning of autumn. December 21 is the winter solstice, that is, the beginning of winter.

Calculated on the day of the month and month of the Common Era.

Spring: February 3-5 at the beginning of spring (solar terms), yellow longitude 315 degrees;

February 18-20 Rainfall (medium air), ecliptic longitude 330 degrees;

March 5-7 Jiaojie (solar terms), yellow longitude 345 degrees;

March 20-22 spring equinox (mid-air), yellow longitude 0 degrees;

April 4-6 Qingming (solar terms), yellow longitude 15 degrees;

April 19-21 intersection, valley rain (mid-air), ecliptic longitude 30 degrees;

Summer: May 5-7 at the beginning of summer (solar terms), yellow longitude 45 degrees;

May 20-22 junction Xiaoman (Zhongqi), yellow longitude 60 degrees;

June 5--7 intersection of mango (solar terms), yellow longitude 75 degrees;

June 21-22 summer solstice (mid-air), yellow longitude 90 degrees;

July 6-8 Jiaojie Xiaoxiao (solar terms), yellow longitude 105 degrees;

July 22-24 festival of the great heat (medium air), yellow longitude 120 degrees;

Autumn: August 7-9 Beginning of autumn (solar terms), yellow longitude 135 degrees;

August 22-24 Jiaojie summer (middle air), yellow longitude 150 degrees;

September 7-9 Bailu (solar terms), yellow longitude 165 degrees;

September 22-24 autumn equinox (mid-air), ecliptic longitude 180 degrees;

October 8-9 junction cold dew (solar terms), ecliptic longitude 195 degrees;

October 23-24 frost (middle air), yellow longitude 210 degrees;

Winter: November 7-8 at the beginning of winter (solar terms), yellow longitude 225 degrees;

November 22-23 intersection, light snow (medium air), yellow longitude 240 degrees;

December 6-8 heavy snow (solar terms), yellow longitude 255 degrees;

December 21-23 winter solstice (mid-air), yellow longitude 270 degrees;

January 5-7 Xiaohan (solar terms), yellow longitude 285 degrees;

January 20-21 festival of the great cold (medium air), yellow longitude 300 degrees.

Respectively: spring), summer, autumn, winter).

In general, January is considered to be the coldest month of the year, so spring is considered to be March, April and May; In summer, June, July, August; Autumn is September, October, November; Winter, for December, January, February. This divides the seasons into four seasons.

This classification of the four seasons mentioned above is generally used in the northern hemisphere, especially in temperate regions where the four seasons are distinct.