The four seasons represent the weather.

Twenty-four solar terms are a knowledge system formed by observing the movement of the sun in a year and understanding the changing laws of the four seasons, climate and phenology in a year. It divides the sun's annual trajectory into 24 equal parts, and each equal part is a solar term, starting from beginning of spring and ending with the great cold. The twenty-four solar terms are divided into four seasons:

1, spring:

Beginning of spring: Fighting refers to Yin; The meridian of the sun is 3 15 degrees. Standing is the beginning, and beginning of spring is beginning of spring.

Rain: fighting fingers; The meridian of the sun is 330 degrees. It began to rain, and it gradually increased.

Stunned: fight with your fingers; The meridian of the sun is 345 degrees. Sting means hiding. Sting refers to the sudden movement of spring thunder, which awakens the hibernating animals in the soil.

Vernal equinox: fighting finger; The meridian of the sun is 0 degrees. Divide means divide equally. The vernal equinox means that day and night are equally divided.

Qingming: fighting refers to Ding; The solar calendar is 15. The weather is sunny and lush.

Grain Rain: Fighting Finger; The meridian of the sun is 30 degrees. Rain has bred hundreds of valleys. With sufficient and timely rainfall, cereal crops can thrive;

2. Summer:

Long summer: refers to the southeast; The meridian of the sun is 45 degrees. The beginning of summer.

Xiaoman: fighting nails; The meridian of the sun is 60 degrees. The seeds of summer crops such as wheat began to plump.

Mangzhong: Fighting refers to yourself; The meridian of the sun is 75 degrees. Crops with awns, such as wheat, are ripe.

Summer solstice: bucket refers to B; The meridian of the sun is 90 degrees. The hot summer is coming.

Small summer heat: fighting refers to Xin; The solar calendar is 105. Hot in summer means hot. Slight summer heat refers to when the climate begins to get hot.

Summer heat: bucket finger c; The solar calendar is 120. The hottest time of the year;

3. Autumn:

Beginning of autumn: refers to the southwest; The solar line is 135. The beginning of autumn.

Summer: fighting fingers; The solar line is 150. Place means stop and hide. Summer is the end of hot summer.

White dew: fighting finger; The solar line is 165. The weather became cold, with dew and white.

Autumnal equinox: the bucket refers to itself; The solar line is 180. Divide day and night equally.

Cold dew: fighting nails; The solar line is 195. Dew is cold and will freeze.

First frost: fingers; The longitude of the sun is 2 10. It's getting colder and colder, and it's frosting;

4. Winter:

Beginning of winter: the war refers to the northwest; The meridian of the sun is 225 degrees. The beginning of winter.

Xiaoxue: Fighting refers to yourself; The meridian of the sun is 240 degrees. This means it's starting to snow.

Heavy snow: fighting fingers; The meridian of the sun is 255 degrees. As the snowfall increases, there may be snow on the ground.

Solstice of winter: fighting fingers; The meridian of the sun is 270 degrees. The cold winter is coming.

Slight cold: fighting fingers; The meridian of the sun is 285 degrees. The climate began to get cold.

Great cold: fighting refers to ugliness; The longitude of the sun is 300 degrees. The coldest time of the year.

Extended data:

According to the law of the operation of heaven and earth, the ancients determined the starting point and ending point of the four-season cycle and divided the 24 solar terms. The trajectory of the sun in a year is divided into 24 equal parts, each of which is a "solar term", collectively called "twenty-four solar terms". Twenty-four solar terms represent twenty-four different positions of the earth in the orbit of revolution.

Because it takes 365 days for the earth to go around the sun, there is a solar term every fifteen days, and each solar term represents different changes in climate, phenology and time. The spring rain shakes the spring and clears the valley, and the summer is full of mountains and summers. Autumn dew, autumn frost, little snow in winter and cold in winter. The solar term song, which is well known to China people, implies the order of the 24 solar terms.

All the year round begins with "four stands", and the so-called "stand" is the beginning. Beginning of spring, Changxia, beginning of autumn and beginning of winter represent the beginning and arrival of spring, summer, autumn and winter respectively. In order to express the characteristics of time series more accurately, the ancients divided the solar terms into four groups according to the weather and phenology: divided, arrived, opened and closed.

1, "fen" is the vernal equinox and autumnal equinox, which was called "dichotomy" in ancient times;

2. "Solstice" is the summer solstice and the winter solstice, which was called "the second solstice" in ancient times;

3. "Qi" is beginning of spring and Changxia;

4. "Closed" refers to beginning of winter, beginning of spring, Changxia, beginning of autumn and beginning of winter in beginning of autumn, which are collectively called "Sili", and these add up to * * * to be "Eight Sections". Corresponding to the most important "eight festivals" in the solar terms.

If you choose the key points in the eight sections, it is the "second solstice" of the summer solstice and the winter solstice. In winter solstice, the sun reaches the southernmost point, while in summer solstice, the sun reaches the northernmost point, which is what the ancients said: "The sun reaches the north, with long days and short shadows, so it is called summer solstice." Do your best.

References:

Baidu Encyclopedia-Twenty-four solar terms (calendar)