Jisho

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不知火 (妖怪)
Wikipedia definition
1. Shiranui (Optical phenomenon)Shiranui is an optical phenomenon characterized by moving, changing fires which appear on the horizon of the Ariake Sea and the Yatsushiro Sea, Kumamoto Prefecture, Japan on the night of special days (August 1 of Chinese calendar). It had been long believed to be a mysterious, fiery yōkai, but today, scientific explanation has been made and it may appear on other days,too. It is a mixture of mirage.
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Read “不知火 (妖怪)” on Japanese Wikipedia
Read “Shiranui (Optical phenomenon)” on DBpedia

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