Light snow solar terms direct sunlight.

When the sun reaches longitude 165 degrees around September 8 every year, it is the "Millennium" solar term.

"White dew" is an important solar term reflecting the growth of cold in nature. As the weather turns cold, it is sunny and hot during the day, but the temperature drops quickly after evening, and the temperature difference between day and night is large. The Millennium basically ended the sultry summer, and the weather gradually turned cold, and the cold gave birth to dew condensation. The ancients used four seasons with five elements. Autumn belongs to gold, gold and white alternate with each other, and autumn dew is described in white, hence the name "White Dew".

Bailu phase 3

Hongyan will arrive later. Red is big and goose is small. They are two different species. Hongyan flies north in February and south in August.

Second, wait for the mysterious bird to return. The mysterious bird is the swallow, which comes from the vernal equinox and is far away from the autumnal equinox. It is a bird in the north, and flying south brings vitality. Now, flying to the north, the safflower has gone halfway, the autumn wind is bleak, and Ye Fei falls all over the mountain. "Twenty-four solar terms": "The mysterious bird sees the vernal equinox (at the beginning of the vernal equinox, the mysterious bird arrives; Yan came), at this time, he moved from north to south. Yan is a southern bird, so he returns. "

A flock of birds breeds shame. This kind of "shame" and "shame" are both delicious food. "Xuanwu hides the shade of wood, and the Dan bird is still ashamed." Raising shame means that birds perceive cold air and store food for winter, such as treasure. "Yi Zhou Shu Shi Xun": "On the day of the Millennium, the geese come, the mysterious birds return on the fifth day, and the birds are ashamed on the fifth day."