Tourists visit a canyon in Pingshan Village in Hefeng County, central China's Hubei Province, Dec. 21, 2020. Winter Solstice, the shortest day of the year, falls on Dec. 21 this year. (Photo by Yang Shunpi/Xinhua)

Photo taken on Dec. 21, 2020 shows the sunrise at Banruo Lake in Houjiazhai Township in Tangshan, north China's Hebei Province. Winter Solstice, the shortest day of the year, falls on Dec. 21 this year. (Photo by Liu Mancang/Xinhua)

Tourists visit a canyon in Pingshan Village in Hefeng County, central China's Hubei Province, Dec. 21, 2020. Winter Solstice, the shortest day of the year, falls on Dec. 21 this year. (Photo by Tan Tao/Xinhua)

Tourists visit a canyon in Pingshan Village in Hefeng County, central China's Hubei Province, Dec. 21, 2020. Winter Solstice, the shortest day of the year, falls on Dec. 21 this year. (Photo by Tan Tao/Xinhua)