Astronomical polar night
Astronomical polar night occurs at locations where the geometric centre of the Sun does not rise above 18 degrees below the horizon line for at least 24 hours (there is no astronomical twilight during the winter solstice). It occurs at latitudes located 18 degrees north of the Arctic Circle and 18 degrees into south of’ the Antarctic circle, which confines it to latitudes north of 84.56°N and south of 84.56°S. It means that for at least 24 hours there is no sunlight reaching latitudes within 5° latitude of the Pole.
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