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The length of polar night varies by latitude from 24 hours just inside the polar circles to 179 days at the poles. As there are various kinds of twilight, there also exist various kinds of polar twilight that progress towards true polar night. Each kind of polar night is defined as when it is darker than the corresponding kind of twilight.
A year in Svalbard is marked by two unusual periods of light: polar night and midnight sun. Polar night runs from mid-November to the end of January, when the sun doesn’t rise above the horizon.
The two frigid zones, or polar regions, experience the midnight sun and the polar night for part of the year – at the edge of the zone there remains one day, the winter solstice, when the Sun is too low to rise, and one day at the summer solstice when the Sun remains above the horizon for 24 hours
The polar circles are imaginary lines shown on maps to be the areas that receives less sunlight due to less radiation. These areas either receive sunlight (midnight sun) or shade (polar night) 24 hours a day because of the earth's tilt. Plants and animals in the polar regions are able to withstand living in harsh weather conditions but are ...
Night-blooming cacti rely on nocturnal pollinators such as bats and moths for reproduction. Light pollution disrupts the patterns in ecosystems and is especially harmful to night-flying insects. Historically, night has been a time of increased danger and insecurity. Many daytime social controls dissipated after sunset. Theft, fights, murders ...
The north polar circle on a polar projection. The polar circle as lines on a modified cylindrical projection. The Arctic Circle in Finland, 1975. The Arctic Circle in Norway at Saltfjellet mountain plateau in July 2003. A polar circle is a geographic term for a conditional circular line (arc) referring either to the Arctic Circle or the ...
Midnight sun at the North Cape on the island of Magerøya in Norway. Midnight sun, also known as polar day, is a natural phenomenon that occurs in the summer months in places north of the Arctic Circle or south of the Antarctic Circle, when the Sun remains visible at the local midnight.
In the IANA time zone database, Svalbard is given one zone in the file zone.tab – Arctic/Longyearbyen. "SJ" refer's to the country's ISO 3166-1 alpha-2 country code, which is used for Svalbard and Jan Mayen collectively. The table below displays data taken directly from zone.tab of the IANA time zone database.