A solar halo (also known as a sundog) appears over Mount Tai in Tai'an, East China's Shandong province on Jan 4. Such halos are an optical phenomenon produced by light interacting with ice crystals suspended in the atmosphere.

Photo taken on Jan 4, 2022 shows a view of a solar halo over Mount Tai, which is a popular tourist attraction in Tai'an city, East China's Shandong province. [Photo/provided to chinadaily.com.cn]

A sundog appears over Mount Tai in Tai'an, East China's Shandong province on Jan 4, 2022, offering an out-of-this-world view. [Photo/provided to chinadaily.com.cn]

Photo taken on Jan 4, 2022 shows a view of a solar halo over Mount Tai and the clouds around the sun form a giant "V" shape. [Photo/provided to chinadaily.com.cn]