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The largest city in the Alaskan Time Zone is Anchorage, Alaska. The Anchorage Metropolitan Area is the largest metropolitan area in the zone. Effective from 2007, the local time changes from AKST to AKDT at 02:00 AKST to 03:00 AKDT on the second Sunday in March and returns at 02:00 AKDT to 01:00 AKST on the first Sunday in November.
Standard Time (SDT) and Daylight Saving Time (DST) offsets from UTC in hours and minutes. For zones in which Daylight Saving is not observed, the DST offset shown in this table is a simple duplication of the SDT offset.
Principal cities: Mexico City, Chicago, Guatemala City, Tegucigalpa, Winnipeg, San José, San Salvador. Belize [18] Canada (Central Time Zone) Manitoba; Nunavut [17] Area between 85th meridian west and 102nd meridian west, except Southampton Island and adjoining islands, and all of Kitikmeot Region; Ontario. West of 90° west [19] Saskatchewan
After getting 30 minutes of daylight, the town of Utqiaġvik, Alaska – formerly known as Barrow – saw its final sunset of the year on Monday as it enters a "polar night."
Twilight occurs according to the solar elevation angle θ s, which is the position of the geometric center of the Sun relative to the horizon. There are three established and widely accepted subcategories of twilight: civil twilight (nearest the horizon), nautical twilight, and astronomical twilight (farthest from the horizon).
The above relation implies that on the same day, the lengths of daytime from sunrise to sunset at and sum to 24 hours if =, and this also applies to regions where polar days and polar nights occur. This further suggests that the global average of length of daytime on any given day is 12 hours without considering the effect of atmospheric ...
The evolution of United States standard time zone boundaries from 1919 to 2024 in five-year increments. Plaque in Chicago marking the creation of the four time zones of the continental US in 1883 Colorized 1913 time zone map of the United States, showing boundaries very different from today Map of U.S. time zones during between April 2, 2006, and March 11, 2007.
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