Astronomisk polarnat

Når solens geometriske center ikke kommer over 18 grader under horisonten i minimum 24 timer, kaldes det astronomisk polarnat (der er ikke noget astronomisk tusmørke hen over vintersolhverv). Dette fænomen opstår ved breddegraderne 18 grader nord for og 18 grader syd for henholdsvis den arktiske og antarktiske polarcirkel. Hvilket betyder at astronomisk polarnat kun forekommer nord for 84.56ºN og syd for 84.56ºS, hvor intet sollys kommer indenfor 5º breddegrader af Polerne i minimum 24 timer.

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