The hidden meaning of spring water in the depths of hard ice

Spring was born in the depths of hard ice, which summarized the winter signs and temperature development trend of the third period of the Great Cold.

"Spring gives birth to an icy abyss, and wanderers return to Xun Mei and koi fish" is a poem written by modern people in combination with the description of the characteristics of solar terms by the ancients. Five days after the severe cold, hens first perceive spring and begin to prepare for brooding. In another five days, the raptor needs strong predation to replenish its body energy and resist the cold. Five days later, in beginning of spring, the ice in the water has frozen to the center of the water, and it is the strongest and thickest. Extreme extremes meet, and when it is frozen to the extreme, it will begin to turn into melting.

In ancient times, five days were called "first class" and the third class was one breath (solar term). Modern meteorology still uses climate: climate, that is, the average temperature every five days