The Beginning of Autumn is the 13th of the twenty-four solar terms. It falls on August 7 or 8 every year.“Autumn” means the end of summer and the beginning of autumn.At the beginning of autumn, the sycamore trees begin to lose their leaves, so there is an idiom that one knows autumn only when one leaf falls.Autumn is a transitional season when the weather turns from hot to cool, and then from cool to cold. Beginning of Autumn is the first solar term of autumn.