Which season is the nickname of Xuan Ying? What are the nicknames in winter?

Wei Zhi's poem "Taoist Temple and Cypress Tree" in the Tang Dynasty: "Being involved in Qingyang will not increase its glory, and crossing Xuan Ying will not reduce its glory." Erya Shi Tian said, "Winter is Xuan Ying."

Xu Xuan: Xuan, the color of winter; Sequence, season. Those who use "Xu Xuan" to call winter, such as the poem "Wind and longevity reflected" by Tang Xujingzong: "The jade (crown) moves Xu Xuan, and the golden bullet is red and cymbals."

Hokuriku: Hokuriku originally refers to the location of the sun in winter, and later it is called winter. Chen Zhi's poem "Recommend Ice" in the Tang Dynasty: "Rites are exhibited at the vernal equinox and firmly established in the north."

Poor yin: in ancient times, spring and summer were yang, and autumn and winter were yin. Winter is the last season of the year, so it is called. Bai Juyi's "Looking at the Thirty Years": "Looking at the North and the South at dusk, I am wandering around for two days."

In addition, Du Fu also used the phrase "poor winter": "poor winter is full of feng shui, and rivers and mountains are foggy." Pi Rixiu used "clear winter": "Nothing can enter clear winter if you live".