Are Xiaoshu and entering ambush the same thing?
No, Xiaoshu does not mean entering ambush. Xiaoshu is the eleventh solar term among the twenty-four solar terms of the lunar calendar, and the fifth solar term of summer, indicating the official start of the summer season. Rufu means entering the dog days of summer. The folk proverb "The number of heads falling down at three times during the summer solstice" is the basis for establishing the first falling down. The almanac stipulates: "On the third Geng day of the summer solstice, the number of volts will begin." This means that counting from the summer solstice to the next, the volts of volts will begin on the third Geng day.
In ancient China, the heavenly stems and earthly branches were combined to record time. There are 10 numbers for the heavenly stems, which are A, B, B, D, Wu, Ji, Geng, Xin, Ren, and Gui. There are 12 numbers for the earthly branches, which are Zi, Chou, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu, Hai. If you match the heavenly stems with the earthly branches, you will get Jiazi, Yichou, Bingyin, Dingmao..., which cross and match 60 times, so it is called 60 Huajiazi. "Three Geng" means encountering three "G" characters, and the third Geng day is the first day of the month. Since there are 10 Heavenly Stems, a Geng Day appears every 10 days, such as Geng Zi Day, Geng Yin Day, Geng Chen Day, etc. 365 days in a year (366 days in leap years) are not integer multiples of 10. One day this year may not be Geng Day next year. Since Geng Day changes constantly, the date of entering the ambush is different every year.
The volts are divided into the first volt, the middle volt and the last volt, which are called the three volts. Summer is the hottest period of the year because the nights are getting shorter and the days are getting longer and the sunlight is closer to direct sunlight. But the summer solstice is not the hottest time yet, because most of the heat absorbed by the ground is dissipated at night. However, more heat is absorbed and less heat is dissipated every day. It accumulates and becomes hotter day by day. In about 20 days, the weather will reach the hottest day.
The date of Sanfu is from the third Geng day after the summer solstice to the first Geng day, from the fourth Geng day to the fifth Geng day to the middle Fu period, from the first Geng day to the third Geng day after the Beginning of Autumn. Two Geng days are the last days. Each Geng day is 10 days apart, and the number of Zhongfu days is not fixed. There are 4 Geng days between the summer solstice and the beginning of autumn, and the Zhongfu is 10 days. There are 5 Geng days, and the Zhongfu is 20 days.
Fu means to escape the heat. Starting from the summer solstice, the days start to get shorter and the nights start to get longer. There is a cold factor lurking in the middle of the heat. The original name "Fu" was very scientific.
Small Heat climate characteristics:
Small Heat is a mild heat, not very hot. The Great Heat is the hottest time of the year. During the Slight Summer Season, the plum rains in the Jianghuai River Basin are about to end, and midsummer begins, with temperatures rising and entering the drought period. North China and Northeast China have entered the rainy season, with frequent tropical cyclone activity, and the number of tropical cyclones landing in China has begun to increase.
The average temperature during Xiaoshu in southern China is around 26°C. In mid-July, the daily average temperature in the low-altitude valley areas of southeastern South China can begin to exceed 30°C, and the daily maximum temperature exceeds 35°C. In the northern part of the Northwest Plateau, frost and snow can still be seen at this time, which is equivalent to the scene in early spring in South China.
With the beginning of the Slight Heat, the Mei Rains in the Yangtze-Huaihe River Basin have ended, and the southeast monsoon rainy season from the Pacific has begun in the vast area north of the Huaihe River and Qinling Mountains in the east. The precipitation has increased significantly, and the rainfall is relatively concentrated; South China, Southwest, and the Qinghai-Tibet Plateau It is also in the southwest monsoon rainy season coming from the Indian Ocean and the South China Sea; while the middle and lower reaches of the Yangtze River generally experience high temperatures and little rain under the control of the subtropical high pressure. In some years, the cold air in the north is still strong before and after the minor summer heat, and is evenly matched with the warm air in the south in the middle and lower reaches of the Yangtze River, resulting in frontal thunderstorms. Thunderstorms during the Slight Summer Season are often the weather information that brings yellow plum blossoms, and it indicates that the rainbands will remain in the middle and lower reaches of the Yangtze River for some time.
Around the time of Minor Heat, most parts of southern China enter the season with the most thunderstorms. Thunderstorm is a severe weather phenomenon, often accompanied by strong winds, heavy rain, and sometimes hail, which can easily cause disasters. In the eastern part of South China, after the minor summer heat, due to the frequent control of subtropical high pressure and frequent sunny and high temperature weather, the period began to enter the drought period. Most parts of southern China have a climate characterized by drought in the east and floods in the west.
Climate characteristics of Dog Days:
The climate characteristics of "Dog Days" are high temperature, low pressure, high humidity and low wind speed. It is the hottest time of the year.
This is because the daytime in summer is longer than the night, the daytime is longer, and the sunshine time is also longer. The heat absorbed by the ground surface is much greater than the expenditure. This causes the heat accumulated on the ground to increase day by day, and the temperature continues to increase. In midsummer, that is, The accumulation of surface heat reaches its peak during the dog days of summer. There is a lot of rain in summer, the air humidity is high, and the heat capacity of water is much greater than that of dry air, which is also one of the important reasons for the muggy weather.
The three volts specifically refer to the first volt, the middle volt and the last volt. Every year, the first and last days of the fall each occupy 10 days, while the middle fall lasts for 10 or 20 days. The specific date of Sanfu is determined by the combination of the solar terms and the dates of the zodiac signs. Geng, ranked seventh among the heavenly stems, belongs to gold when matched with the five elements. Metal is afraid of fire and will decrease day by day in the weather of several volts. Therefore, the ancients used Geng days to calculate "volts". The traditional calculation method in my country stipulates that the third Geng day after the summer solstice and the fourth Geng day are the starting dates of Chufu (Toufu) and Zhongfu (Two Fu) respectively, and the first Geng day after the beginning of autumn is the last day. The first day of summer. The length of the Dog Day period is not exactly the same every year. If the Dog Day ends after the Beginning of Autumn, it will last for 30 days; if it ends before the Beginning of Autumn, it will last for 40 days (the Dog Day will last for 20 days).