The Millennium is in autumn. This is the third solar term in autumn, marking the end of Qiu Meng and the beginning of Mid-Autumn Festival. When the weather turns cold, you will find many dewdrops on the ground and leaves in the morning. This is because water vapor condenses on it at night, so it is named Bailu. So the Millennium actually means that the weather is getting cold. The ancients used four seasons with five elements, and autumn was golden and golden white, so white was used to describe autumn dew. The Millennium solar terms basically ended the sultry summer, which was the turning point from sultry to cool in autumn. After a thousand years, the sky is high and the clouds are light, the wind is crisp and the temperature difference between day and night is large. At night, you will feel a little cold, and obviously feel that cool autumn has arrived.