Choice: Is the last day of summer ()?

The last day of summer is the day before autumn begins.

Beginning of autumn, the 13 solar term in 24 solar terms, is the first solar term in autumn, which falls on August 7-9 of the Gregorian calendar every year. At this time, the bucket handle of the Big Dipper points southwest, and the sun reaches longitude 135. The 24 solar terms reflect the changes of "Qi" in the four seasons. Beginning of autumn is the node where the yang gradually closes, the yin gradually grows, and the yang gradually turns to yin. Beginning of autumn, which also means precipitation and humidity, is at the turning point of the year, with a downward or decreasing trend; In nature, everything begins to grow from lush to mature.

Seasonal division

1. astronomical method: the traditional method of dividing the four seasons is based on the change of astronomical phenomena. The starting point of the four seasons is "Li Si" in the 24 solar terms, so beginning of autumn is the starting point of autumn. Beginning of autumn is the starting date of autumn according to the astronomical observation position. Autumn begins in the beginning of autumn and ends in beginning of winter, which is the result of celestial movement.

2. Temperature method: At present, the four seasons are often divided according to the temperature change, and the "average weather temperature" of modern scholar Zhang Baokun is used to divide them. According to the weather average temperature method, the average daily temperature for five consecutive days is between 10℃ and 22℃, which is regarded as autumn.