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Nautisk polarnat

Nautisk polarnat er når solens geometriske center ikke kommer over 12 grader under horisonten i minimum 24 timer (der er ikke noget nautisk tusmørke hen over vintersolhverv). Astronomisk tusmørke kan opleves omkring lokal middag. Det forekommer ved breddegrader placerede 12 grader nord for den Arktiske cirkel og 12 grader syd for den Antarktiske cirkel, hvilket afgrænser forekomsten til breddegrader nord for 78.56°N og syd for 78.56°S.

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