2. Polar nightThe polar night occurs when the night lasts for more than 24 hours. This occurs only inside the polar circles. The opposite phenomenon, the polar day, or midnight sun, occurs when the sun stays above the horizon for more than 24 hours.
Read “Polar night” on English Wikipedia
Read “極夜” on Japanese Wikipedia
Read “Polar night” on DBpedia
Read “Polar night” on English Wikipedia
Read “極夜” on Japanese Wikipedia
Read “Polar night” on DBpedia
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