Han Xiao's poems are beautiful.

? ? Han Xiao (Yuan Zhen)

Han Xiaolu, Huan birds build new nests.

Picking up food to find a winding path, holding purple around the treetops.

The frost eagle is near the north head, and the pheasant is hidden in the bushes.

Not strange but strict, spring and summer are in the first month.

In 2003, Yu sent someone to visit his home in Houshan.

Slight cold is the 23rd solar term among the 24 solar terms, the 5th solar term in winter, the end of the second month of the dry calendar and the beginning of the ugly month. Fighting fingers; The meridian of the sun is 285; It is celebrated every year on June 5-7 of 65438+ 10 in Gregorian calendar. Cold air is cold for a long time, and slight cold means that the weather is cold but not extreme. Like severe cold, mild summer heat, severe summer heat and intense summer heat, it is a solar term indicating temperature change.

The slight cold solar term is characterized by cold, but it is not extremely cold. ?

In the slight cold season, the direct point of the sun is still in the southern hemisphere, and the heat in the northern hemisphere is still in a state of loss. The heat absorbed during the day is still less than the heat released at night, so the temperature in the northern hemisphere continues to decrease. After the winter solstice, the cold air frequently goes south, and the temperature continues to drop, and the temperature drops to the lowest during the slight cold and severe cold in a year.

There is a folk saying, "It's 239 when it's a slight cold, and it's shivering with cold", which shows the cold degree of solar terms.

According to China's long-term meteorological records, the slight cold solar terms are colder than the severe cold solar terms in the north, and there is a saying in the north that "slight cold is better than severe cold"; However, for some parts of the south, the lowest temperature in the whole year will still appear in the great cold solar terms. The slight cold in northern China is colder than the severe cold, because there is relatively little "residual heat" on the surface, which has been completely released by the slight cold, so that the temperature is minimized.

In the south, the surface is relatively hot, and its "residual heat" was not released until the slight cold. In severe cold, the surface "waste heat" is exhausted and the temperature is minimized.