Scientific basis for peasant proverbs

"Clouds cover the moon on the 15th day of August, and snow lights up the lanterns on the 15th day of the first lunar month" reflects the echo between the festival weather.

The Mid-Autumn Festival is a traditional folk festival in our country. As the saying goes, the moon is particularly bright during the Mid-Autumn Festival. On the night of the Mid-Autumn Festival, the bright moon is in the sky, and silver light shines on the earth. In this pleasant climate and quiet night, people gather together to watch the bright moon and tell their children the magical stories of Chang'e flying to the moon, the laurel tree and the Jade Rabbit.

If dark clouds cover the moon and the sky is gloomy on this day, it will be disappointing! But it means another traditional festival in our country, the Lantern Festival, when every household lights up lights and colors, snowflakes are flying, and it is exciting.

The correlation between the weather of these two traditional festivals has long attracted people's attention. Over time, in many places, if the sky is full of dark clouds on the night of August 15th, snowflakes will often appear on the 15th day of the first lunar month. So people concluded that the weather proverb: "Clouds cover the moon on August 15th, and snow lights up the lights on the 15th day of the first lunar month", which has been widely circulated.

Of course, the rhythmic activity of the atmosphere is a very complex issue. Its causes, conditions, manifestations, and many other aspects are not yet clearly understood. This regularity does not exist everywhere. Each year can be matched.

Now, many meteorologists are conducting in-depth research on the rhythmic activities of the atmosphere and its causes. The research results in this area will undoubtedly be of great benefit to the development of long-term weather forecasting.

"Clouds cover the moon" and "snow lights up the lights", on the surface, are echoes of clouds and snow, but in essence they are echoes of two cold air activities. In other words, if before and after the Mid-Autumn Festival, There is cold air activity, causing the phenomenon of "clouds covering the moon". Then, around the Lantern Festival, cold air will invade again, creating a "snow lighting up" situation. Therefore, the proverb "clouds cover the moon on August 15th, and snow lights up the lights on the 15th day of the first lunar month" is a reflection of the rhythmic activity of the cold air that invades our country for about five months. Based on this proverb, many meteorological stations have studied the rhythmic relationship of cold air activity for about five months and used it for long-term weather forecasting, achieving good results. The weather on other days also has this rhythmic relationship, but it has not been used yet. It's just generally noticed by people.

◆ The echo between holiday weather is a manifestation of atmospheric rhythmic activity

Why is there a relationship between two holiday weather that are 150 days apart? It turns out that this is It is a manifestation of atmospheric rhythmic activities. The earth's atmosphere is like a large orchestra. Wind, clouds, rain, snow, thunder, lightning, fog, and frost are like the orchestra playing a piece of music with rich tones. Many research works have shown that under the simultaneous action of various physical factors, this large-scale movement played in the atmosphere also shows a certain "rhythm".

That is to say, a certain weather process is more obvious at a certain moment. Under certain conditions, after a period of time, it becomes obvious again, or it manifests itself in other forms due to different seasons. Just like the beats in music, there is no direct evolutionary relationship between them on the surface, but in fact there is a certain connection. In climatology, this internal connection in the atmosphere is called the rhythmic activity of the atmosphere.

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