0 a night or the time in winter at places close to the North or South Pole, when the sun does not appear above the horizon --
The sun shines 24 hours in the summer, and barely ever shines at all in the winter (see midnight sun and polar night).
The flora benefits from the long period of midnight sun, which compensates for the polar night.
Polar night and midnight sun last about 3 months per year on the south and 5 months on the north.
These areas either receive sunlight (midnight sun) or shade (polar night) 24 hours a day because of the earth's tilt.
That is the polar night.
This is called a polar night.
During the astronomical polar night stars of the sixth magnitude, which are the dimmest stars visible to the naked eye, will be visible throughout the entire day.
The opposite phenomenon, polar night, occurs in winter when the sun stays below the horizon throughout the day.
