2, Autumn does not mean that the hot weather is over, Autumn is still in the summer heat period, not yet out of the summer, the third season in the fall (summer) before the summer, the weather is still very hot during early autumn. The so-called "hot in three volts", and "after the fall a volt" said, after the fall there is at least "a volt" of hot weather. The "three ambrosia" has the first, middle and last ambrosia, and its date is determined by the date of the festival and the date of the stem and branch calendar. In accordance with the "three ambush" projection method, "Autumn" this day is often still in the middle of the ambush period, that is to say, the summer heat is not over, the real cool generally to the White Dew after the festival. The watershed between the heat and the cool is not in the Autumn Festival.
3. Autumn is the season of alternating heat and coolness. The Tube says: "The yin qi of the fall begins to fall, so everything is collected." Entering the fall, the transition from the summer rainy hot and humid to autumn less rainy dry climate. In nature, the yin and yang qi began to change, yang qi gradual collection, yin qi gradual growth, all things with the yang qi sinking and gradually decline. The most obvious change in autumn is that the leaves of grass and trees change from lush green to yellow and begin to fall, while crops begin to ripen. Autumn is one of the ancient "four seasons and eight festivals", the folk have sacrificed to the God of the land, to celebrate the custom of the harvest.