The full moon, known as the Blue Moon, is seen over Jiamusi City, northeast China's Heilongjiang Province, May 31, 2026. (Photo by Chen Zhiguo/Xinhua)

The full moon, known as the Blue Moon, is seen over Shuangyashan City, northeast China's Heilongjiang Province, May 31, 2026. (Photo by Han Yang/Xinhua)

The full moon, known as the Blue Moon, is seen over Tongjiang City, northeast China's Heilongjiang Province, May 31, 2026. (Photo by Liu Wanping/Xinhua)

The full moon, known as the Blue Moon, is seen over Jiayin County, northeast China's Heilongjiang Province, May 31, 2026. (Photo by Li Shaojun/Xinhua)

The full moon, known as the Blue Moon, is seen over Jiamusi City, northeast China's Heilongjiang Province, May 31, 2026. (Photo by Chen Zhiguo/Xinhua)

The full moon, known as the Blue Moon, is seen over Fujin City, northeast China's Heilongjiang Province, May 31, 2026. (Photo by Geng Xiqing/Xinhua)