What are the origins of the Millennium and solar terms?

1. In ancient times, people used four seasons to match the five elements. Autumn belongs to gold in the five elements, corresponding to white, so white is used to describe autumn dew. Over time, the autumn dew is called the white dew.

The Millennium is the third solar term in autumn, which marks the end of Qiu Meng and the beginning of Mid-Autumn Festival.

3. The Millennium is usually between September 7th and September 9th in Gregorian calendar, which is the solar term with the largest temperature difference between day and night.

At this time, the summer heat gradually disappears, the weather gradually turns cold, and the dew in the morning increases day by day, which condenses into a layer of white water droplets on the surface of the grass.