What is "polar nights"

Usage examples of "polar nights".

On such occasions it is no longer invisible, for it reveals itself in the glowing curtains of the aurora - one of Nature's most awesome spectacles, illuminating the cold polar nights with its eerie radiance.

Many items were carried as standard equipment in ICY parties, both in the field and at base camps, and none more standard than the magnesium flares which first came into common use in the Antarctic over a quarter of a century ago - they are indispensable as location beacons in the long polar nights - and radiosondes.

Black because they wear long black garments, and the salt that collects even under their nails, that they continue tasting bitterly [43] and swallowing during the sleep of those polar nights, the salt they drink in the water from the only spring in the hollow of a dazzling groove, often spots their dark garments with something like the trail of snails after a rain.

Black because they wear long black garments, and the salt that collects even under their nails, that they continue tasting bitterly [43] and swallowing during the sleep of those polar nights, the salt they drink in the water from the only spring in the hollow of a dazzling groove, of­.

At first time was all nights, unbroken polar nights, with tiny fractional days lasting a minute or two at a time.