First frost double ninth festival
The festival date of the Double Ninth Festival is set on the ninth day of the ninth lunar month. However, because there are leap months in some years and there are no leap months in some years, the lunar calendar date corresponding to the Double Ninth Festival is not fixed and changes greatly every year. The first frost is one of the twenty-four solar terms of the lunar calendar, and it is generally celebrated on the Gregorian calendar (10)1October 23-24, with a relatively fixed festival cycle.
The solar calendar of this year's Double Ninth Festival is 65438+1October 23rd, while the solar term of Hanlu is 65438+1October 8th. This year's Double Ninth Festival is much later than the cold dew solar term. Last year (2022) was just the opposite. Last year, the time of the Double Ninth Festival was 65438+10.4, and the cold dew solar term was 65438+10.8, and the time of the Double Ninth Festival was earlier than the cold dew solar term. One of the main reasons why the time of the Double Ninth Festival is different from that of the cold dew festival is the existence of leap month. Once the year of leap month appears, it is possible to change the order.
This is because the "twenty-four solar terms" reflect the annual apparent motion of the sun and its influence on the earth, and are determined according to the position of the sun on the return to the ecliptic. However, the first frost this year is unusual. 65438+1October 23rd is the Double Ninth Festival, and 65438+1October 24th is the first frost solar term, which is very unusual.
Meteorological changes of the first frost;
The "first frost" solar term is characterized by cold weather in the morning and evening, hot weather at noon, large temperature difference between day and night, and obvious autumn dryness. On the national average, the first frost is the season with the largest temperature difference between day and night in a year. After entering the first first frost solar term, the cold air activities affecting our country became more and more frequent, and the temperature difference between day and night increased rapidly. Especially in Jiangnan and South China, the temperature fluctuation is more and more obvious; Some areas in northwest and northeast China have shown the scene of "cold wind and fallen leaves" in early winter.
During the first frost period, it usually lasts from late June 10 to1early October 10. As dry and cold air gradually dominate the whole country, warm and humid air is marginalized, and many weather with characteristics of summer and early autumn exits, so the weather is relatively simple. Before and after beginning of winter, there were often strong winds and cool weather, and some places entered winter in a short time. The "first frost" solar term reflects the climatic characteristics of the cold weather, but it does not mean that it will be "frost" when entering this solar term.