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People shop for Yalda Night in Tehran, Iran, on Dec. 20, 2018. Yalda Night is celebrated on the longest night of a year, which is locally believed to be on Dec. 21, the eve of winter solstice.(Xinhua/Ahmad Halabisaz)
People shop for Yalda Night in Tehran, Iran, on Dec. 20, 2018. Yalda Night is celebrated on the longest night of a year, which is locally believed to be on Dec. 21, the eve of winter solstice.(Xinhua/Ahmad Halabisaz)