According to the folk saying, in which solar term of the year, before dawn, you should go outdoors to absorb the earth's atmosphere?

The ancients said: the solstice in winter is a sunny day.

"The Scholars" said: "In early autumn, tung leaves fall, and on the winter solstice, they fly away."

That is to say, at that moment in beginning of autumn, the first leaf of buttonwood fell; At this moment of winter, the ashes on the ground are flying "Yang".

Scar ash is a thin film in bamboo or reed stalks. The burnt ash is so light that it can be blown by "Yang".

I haven't tried it, and I don't believe it.

On the day of winter solstice, you can "suck the earth".