Lidong, one of the twenty-four solar terms, is characterized by the handle of the dipper pointing to the north-west and the sun's yellow longitude reaching 225°. It is a seasonal solar term that indicates the beginning of winter.

The beginning of winter means that life begins to close up, and everything enters a state of recuperation and collection. Its climate also changes from a dry autumn with little rain to a winter climate with rain and cold.

After the beginning of winter, the sunshine time will continue to shorten, and the height of the sun at noon will continue to decrease. Winter ordinary prevalence of northeast and north winds, the temperature gradually decline, due to the surface of the stored heat there is still a certain amount of energy, so the general early winter period is not very cold; as time goes by, the strong cold air south frequently, and across the South Ridge, the weather is getting colder and colder. In the northern regions, it is already cold before winter.

Traditionally, the "winter" as the beginning of winter, "spring, summer growth, autumn harvest, winter," winter is to enjoy the harvest, rest and recuperation of the season, winter in ancient folk "four times eight festival "In ancient China, some places will be held in winter rituals, banquets and other activities, as an important festival to celebrate.

Lidong

Lidong, October Festival. Li, build the beginning is also; winter, the end is also, all things collection is also.

Water begins to ice. The surface of the water is condensing, but not to the firm also.

The ground began to freeze. The earth is cold, not to the demolition.

Pheasant into the water as mirage. Pheasant, pheasant; Zheng Kangcheng, "huainanzi", high allure all note mirage for big clam. The jade chapter " also said: mirage, big clam. "Mozi" also said: clam, a mirage, clam is not a clam class? Rites of note" said auger genus, "Bei Ya" and to clam, mirage, seemingly non-clam type. However, according to the "Materia Medica" car chelae article said: car chelae, is a big clam, a mirage, can spit gas for the platform, and tasted the seaside mirage into the building wall. Chapter Turtle scripture" said: mirage large for the wheel island, the moon idle spit gas into the building, with the dragon also. Then know this for the clam, clear. Moreover, "er ya wing" cited the Zhou rituals of the family, the defense of mirage for the clam is very clear. Rites of Note" to the pheasant, due to the snake said, so the pheasant for the mirage, "Bei Ya" said both like a snake and big, all the scales under the belly, know that is known, but then again doubt: a said like chi dragons, with ears, horns, it is also heard and recognized, not as the "Materia Medica", "Chapter Turtle Jing" is, that is, a thing ear. Dashui, Huai also, Jin said: pheasant into the Huai for mirage.