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Astronomisk polarnatt

Astronomisk polarnatt oppstår på steder hvor det geometriske senteret til solen ikke stiger over 18 grader under horisonten i minst ett døgn. Det forekommer ved breddegrader som ligger 18° nord for den nordlige polarsirkelen (dvs. nord for 84.56°N) og 18° sør for sydlige polarsirkelen (dvs. sør for 84.56°S). Det betyr at i en polarnatt er det ikke noe sollys som når områdene innenfor 5° fra polene.

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