What's the difference between light snow and heavy snow?

Light snow and heavy snow are one of the 24 solar terms. Xiaoxue is the twentieth of the twenty-four solar terms, and the time is165438+1October 22nd or 23rd. Heavy snow is 2 1 solar term in the 24 solar terms, and the time is between 65438+February 6 -8 in the Gregorian calendar every year. Light snow indicates the beginning time and degree of snowfall, and the solar term of heavy snow is the beginning time and degree of heavy snow. They are solar terms that directly reflect precipitation, just like rain and Grain Rain. Let's understand the meaning of light snow and its difference from heavy snow with Bian Xiao. What does the light snow solar term mean?

"Light Snow" is a festival that reflects weather phenomena. There is little snow, and there is no snow on the ground. This is the original meaning of the solar term "light snow". The ancient book "Qunfangpu" says: "Light snow will snow when it is cold, and it will not even snow on the ground, and the snow is not big." In other words, due to the cold weather, the form of precipitation changed from rain to snow in the "light snow" festival, but at this time, because the ground is not very cold, the number of snows is small and the amount of snow is not large, so it is called light snow.

So light snow indicates the beginning time and degree of snowfall. Light snow, like rain and Grain Rain, is a solar term that directly reflects precipitation.

What does the snow solar term mean?

The "heavy snow" solar term usually falls on 65438+February 7 every year (there are also 6 or 8 days in individual years). When the longitude of the sun reaches 255 degrees, it is one of the 24 solar terms. Heavy snow, as the name implies, has a large amount of snow. The ancients said: "The great man is prosperous, and the snow is prosperous here." At this time, it often snows heavily and widely, hence the name heavy snow.

At this time, the lowest temperature in most parts of China has dropped to 0℃ or below. Often, in areas where cold and warm air meets strong cold air fronts, there will be heavy snow or even blizzard. It can be seen that the solar terms of heavy snow indicate the starting time of this period and the degree of heavy snow, which, like the solar terms of light snow, rain and Grain Rain, directly reflect the precipitation.

What's the difference between light snow and heavy snow?

The difference between light snow solar terms and heavy snow solar terms is shown in the following aspects:

1, different times

Xiaoxue: Xiaoxue is the twentieth of the twenty-four solar terms. The time is165438+1October 22 or 23, when the sun reaches 240 degrees of the yellow meridian, it is called the light snow solar term. At this time, the sun is at-2016' at the declination. On this day, Beijing's daylight saving time is only 9 hours and 49 minutes, and the height of the sun at noon is only 29 50'.

Heavy snow: the 2nd1solar term in 24 solar terms, which falls between February 6th and 8th in the Gregorian calendar every year, and is the end of the month and the beginning of next month. At that time, the sun will reach 255 degrees. "Twenty-four solar terms" said: "There is heavy snow, November Festival, and there is abundant snow so far." Heavy snow means colder weather, and the possibility of snowfall is greater than that of light snow. This doesn't mean that there must be a lot of snowfall.

2. Different astronomical positions

Xiaoxue: During the "Xiaoxue" solar term, the bucket handle of the Big Dipper points to the northwest at night (equivalent to 10 on the clock). Every night after 20: 00, if you look at the stars at home, you can see that the Big Dipper sinks in the west, while the W-shaped Cassiopeia rises to the sky. Instead of the Big Dipper, she found the coordinates of Polaris and navigated for the stargazers. The quadrilateral Pegasus is facing the sky, and Orion, which symbolizes the winter starry sky, is already on the eastern horizon.

Heavy snow and solar terms, the longitude of the sun reaches 255 degrees. Heavy snow, as the name implies, has a large amount of snow. The ancients said: "The great man is prosperous, and the snow man is prosperous here." . At this time, it often snows heavily.

The climate is different.

Entering this solar term, the northwest wind began to become a frequent visitor in China, and the temperature gradually dropped below 0℃, but the earth was not too cold. Although it began to snow, the amount of snow was not large, so it was called light snow. At this time, Yin Qi fell and Yang Qi rose, which led to the impassability of heaven and earth, the imbalance of yin and yang, the loss of vitality of everything, and the occlusion of heaven and earth into the severe winter. The first snow will appear in the area north of the Yellow River, reminding people that it is time to keep out the cold and keep warm.

4. Different phenology

Xiaoxue: In ancient China, Xiaoxue was divided into three stages: "When the rainbow disappeared, it disappeared; Second, the weather is rising and the atmosphere is falling; It was blocked three times and turned into winter. "The sun rises in the sky, and the yin falls in the ground, which leads to the impassability of heaven and earth, and the disharmony of Yin and Yang, so everything loses its vitality, and the world is blocked and becomes a cold winter.

During the light snow solar term, a relatively stable meridional circulation has been established in East Asia, and low pressure or trough often appears in Siberia. When moving eastward, there will be a large-scale cold air going south, and there will be a large-scale gale and cooling weather in eastern China. Light snow solar term is a solar term with high frequency of cold wave and strong cold air activity. When strong cold air affects, it is often accompanied by the first snow in winter.

Heavy snow: At this time, the minimum temperature in most parts of China has dropped to 0℃ or below. Often, in areas where cold and warm air meets strong cold air fronts, there will be heavy snow or even blizzard. It can be seen that the solar terms of heavy snow indicate the starting time of this period and the degree of heavy snow, which, like the solar terms of light snow, rain and Grain Rain, directly reflect the precipitation.

5. There are different ways to calculate the date.

Xiaoxue: The "Xiaoxue" solar term generally falls on June 22nd or 23rd every year 165438+ 10, with the formula (limited to Dongba time zone) (y× d+c)-L.

Interpretation of the formula: Y= two digits after the number of years, D=0.2422, L= leap year, 2 1 century C=22.36, and 20th century =23.08.

For example, the date of light snow in 2088 = (88× 0.2422+22.36)-(88÷ 4) = 43-22 = 2 1, 165438+ 10/0/.

Exception: 1978 plus 1 day.

Heavy snow: [Y*D+C]-L

Interpretation of the formula: Y= two digits after the number of years, D=0.2422, L= leap year, 2 1 century C=7. 18, and 20th century =7.9.

For example, the date of heavy snow in 2088 = [88× 0.2422+7.18]-[88/4] = 28-22 = 665438+heavy snow on February 6.

Exception: 1954 plus 1 day.