立秋：中国农历的秋季开始 - 意义和习俗

In the Chinese lunar calendar, '立秋' (Start of Autumn) signifies the end of summer and the beginning of autumn. The first change brought by '立秋' is the weather, with temperatures gradually dropping. When people see leaves starting to turn yellow and fall, they know that autumn has arrived, which is known as '一叶知秋' (one leaf knows autumn). However, the hot weather is not completely over at this time, and high temperatures usually continue for a while, which is known as the 'autumn tiger' (秋老虎). '立秋' holds great significance for farmers as various autumn crops start to grow rapidly and ripen, indicating that the harvest season is approaching.