A solar halo, one type of optical phenomenon in which a ring appears to circle the sun, was observed by tourists on Tianmen Mountain in Zhangjiajie, Hunan province on Monday.
Solar halos usually appear in spring and summer. They signal a change in the weather.
As the highest mountain in Zhangjiajie, Tianmen Mountain can always be counted on to host meteorological wonders such as sea of clouds and mirage.
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