Frostfall, one of the twenty-four solar terms, every year around October 23, the frosty solar terms contain the cold weather, the meaning of the first frost, is the last solar term in the fall, it also means the beginning of winter, the season of frost, health care is especially Importantly, there is a saying in the folks that "a year is full of transparency, it is better to make up the frost", which shows the impact of this solar term.
The origin of the solar terms:
Every year around October 23 of the solar calendar, when the sun reaches 210 degrees of the Yellow River, it is the frost in the 24 solar terms. The frost is the last solar term in the fall and the transitional season from autumn to winter. In the autumn evening, there is a lot of heat on the ground, and the temperature suddenly drops below 0 degrees. The water vapor in the air directly condenses on the ground or on the plants to form fine ice needles, and some become hexagonal frost flowers, which are white in color and loose in structure.
"The seventy-two month set of the monthly plan" on the frosty said: in mid-September, the gas is condensed, and the knot is frost. "Frost" means that the weather is getting colder and the dew is condensed into frost. In ancient China, the frost was divided into three: a waiting for the beast; two waiting for the grass to fall; three waiting for the locusts. The wolf began to capture the prey, sacrifice the beast, and sacrifice the heavenly newspaper with the beast. The square pavilion sacrificed the meaning of the autumn gold; the leaves on the earth were yellow and falling; the locusts were all still in the hole, and they hung their heads to enter the hibernation state. in.
In ancient China, the frost was divided into three: “Awaiting the beast; the second waiting for the grass to fall; the three waiting for the locusts to fall.” The prey in this solar term will display the prey and then eat it.
Every year around October 23, the solar calendar reaches the frost when the sun reaches 210 degrees. The frosty indicates that the weather is colder and the dew is condensed into frost. "Annual Seventy-two Hours Collection": "In mid-September, the gas is condensed and the condensate is frosty." At this time, hoarfrost has appeared in the Yellow River Basin in China, and a silver ice crystal flashes on the thunderstorm. At this time, the leaves are yellow and deciduous. The ancient book "The 24th Festival" explained: "The gas is clean and the frost is falling, and the yin begins to condense." It can be seen that "the frost falls" means that the weather is getting colder and begins to frost. In meteorology, the first frost in the fall is generally called "early frost" or "first frost", and the last frost in spring is called "night cream" or "final cream". The interval between the final frost and the first frost is the frost-free period. There is also the early frost called "Chrysanthemum Cream", because at this time the chrysanthemum blooms, the Northern Song Dynasty writer Su Shi has a poem: "Thousand trees sweep a yellow, only Furong alone."
The frost is formed by the condensation of water and water. How does the water vapor form a frost? The Southern Song poet Lu Benzhong wrote in the "South Songs · Travel Thoughts": "Invading the moon, the bridge is a night frost." Lu You wrote in "Frost Moon" that "the grass is frosty white, the cold window is new." Appeared in the autumn sunny night. There is no cloud in the autumn night, the ground is like a quilt, the heat is a lot, the temperature suddenly drops below 0 °C, the water vapor on the ground will condense on the stream, the bridge, the leaves and the soil, forming a fine ice needle. Some become hexagonal frost. Frost can only be formed on a sunny day. People say "the thick frost and the sun" is the truth.