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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.
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
Such designations can be ambiguous; for example, "CST" can mean China Standard Time (UTC+8), Cuba Standard Time (UTC−5), and (North American) Central Standard Time (UTC−6), and it is also a widely used variant of ACST (Australian Central Standard Time, UTC+9:30). Such designations predate both ISO 8601 and the internet era; in an earlier ...
UTQIAGVIK, Alaska – America's northernmost town is about to experience the annual phenomenon of polar night.. Starting at 1:27 p.m. AKST Monday, the sun will set for the final time this year in ...
Time zones of the world. A time zone is an area which observes a uniform standard time for legal, commercial and social purposes. Time zones tend to follow the boundaries between countries and their subdivisions instead of strictly following longitude, because it is convenient for areas in frequent communication to keep the same time.
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.
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.
Utqiagvik, Alaska, the northernmost point in the United States, experiences 65 days of polar night. [9] At the pole itself, polar night lasts 179 days from September to March. [9] Diagram of atmospheric refraction at sunrise and sunset. Over a year, there is more daytime than nighttime because of the Sun's size and atmospheric refraction. The ...