Jisho

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Noun
1. night under the midnight sun; white night (at extreme latitudes); night during which the sun doesn't set
Wikipedia definition
2. Midnight sunThe midnight sun is a natural phenomenon occurring in summer months at latitudes north and nearby to the north of the Arctic Circle, and south and nearby to the south of the Antarctic Circle where the sun remains visible at the local midnight. Given fair weather, the sun is visible for a continuous 24 hours, mostly north of the Arctic Circle and south of the Antarctic Circle. The number of days per year with potential midnight sun increases the farther poleward one goes from the equator.
Read “Midnight sun” on English Wikipedia
Read “白夜” on Japanese Wikipedia
Read “Midnight sun” on DBpedia
Other forms
白夜 【はくや】

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