Borger polarnat

Når solens geometriske center ikke kommer over 6 grader under horisonten i minimum 24 timer, kaldes det borger polarnat (der er ikke noget borger tusmørke hen over vintersolhverv). Ved lokal middag kan nautisk tusmørke opleves. Det forekommer ved breddegrader 6 grader nord for den Arktiske- og 6 grader syd for den Antarktiske cirkel. Dette afgrænser forekomsten til breddegrader nord for 72.56°N og syd for 72.56°S.

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