Notes at the beginning of autumn

Beginning of autumn is the13rd solar term among the 24 solar terms, and it is celebrated from August 7th to 9th in the Gregorian calendar every year. At this time, the bucket handle of the Big Dipper points southwest, and the sun reaches longitude 135. Beginning of autumn is the first solar term and the starting point of autumn. Autumn begins in the beginning of autumn and ends in beginning of winter, which is the result of celestial movement. Beginning of autumn is the node where yang gradually closes, yin gradually grows, and yang gradually turns into yin. Autumn means precipitation, humidity, etc. At the turning point of the year, there is a downward or decreasing trend; In nature, everything begins to grow from lush to mature.

Beginning of autumn doesn't mean the extreme hot weather is over. Beginning of autumn is still in the summer heat period, and the summer heat will not come out until the second solar term in autumn. It's still very hot in early autumn. The so-called "heat is in the dog days" is also called "beginning of autumn drops later", and there is at least "falling" hot weather after beginning of autumn. "Three Volts" can be divided into initial volt, intermediate volt and final volt, and its date is determined by the matching of solar term date and main branch year date. According to the calculation method of "three volts", the day of "beginning of autumn" is often still in the midsummer period, that is to say, the heat is not over, and the real coolness usually comes after the Millennium solar terms. The watershed of summer heat is not in the solar terms in beginning of autumn.

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