Barrow, Alaska, at the very top of the state, has a two-month winter period in which the sun doesn't rise. On November 18 or 19 the sun goes down, and remains below the horizon for about 65 days until it re-appears, normally on January 22 or January 23. During the time of polar night there is a decreasing amount of twilight each day, and on winter solstice, December 21 or December 22, civil twilight in Barrow lasts for a mere 3 hours.
http://www.archive.org/details/AMR135
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