This standard was based on a longitude east of Greenwich that was 11 hours and 30 minutes ahead of that meridian. In 1868 New Zealand (at that time a British colony) employed a standardized time to be used throughout the colony. Over 98% of Britain’s clocks were kept using GMT by 1855, but it didn’t become legally implemented until 1880. On December 1st, 1847 standard time was officially adopted by British railways in the form of Greenwich Mean Time (GMT) which they kept accurate using portable chronometers. The issue was far more prevalent when rail transport and telecommunications became more widespread. Every degree of longitude brought with it four minutes of variation.Īs a result of these variations of time based on geological location, it became apparent that we needed a universal way to offset the time in each location to account for these changes in the time of day. Geological longitude made telling time much more difficult when rail transport became prevalent. Greenwich Mean Time (GMT) was created in 1675 at the time of the Royal Observatory’s construction, to help mariners find their longitude when they were out at sea. Sundials and the like were used to tell what time of day it was. Before transportation became readily available, the time of day was derived from the apparent solar time. Some locations do have offsets of 30 or 45 minutes such as Nepal and Newfoundland, but for the most part they are all whole hours away from UTC. The concept of a time offset refers to the amount of time added to, or subtracted from UTC which results in that location’s “civil time.”ĭepending on the zone, people will observe this standard time all year long, or they will observe Daylight Saving Time, also known as Summer Time in other parts of the world. For the most part, these zones are offset from Coordinated Universal Time (UTC) by whole numbers of hours either positive or negative in regards to the starting point. ![]() Time zones were originally created as a means of creating a uniform standard time for legal, commercial, and social purposes.Īreas that are close in terms of commercial dependence or constant communication are usually located in the same time zone. Plainly speaking, time zones are geographical regions where generally everyone uses the same standard time. ![]() It is commonly referred to in military time with the letter “U” representing the time zone. In this designation the offset is eight hour behind UTC. This military time zone is used for aviation and refers to a stretch of sea between 127.5 degrees West and 112.5 degrees West. This time zone is also 8 hours behind UTC but is used exclusively by certain pacific islands which are listed below: The Aleutian Islands west of 169.30 West longitude are the one exception. During this time the offset is 8 hours behind Universal Coordinated Time and therefore falls into the same offset as PST. This zone is used in the state of Alaska during the summer time as a form of Daylight Saving Time. Below are time zones in the same offset with different names: This state observes both PST and PDT like the other locations on this list. ![]() There is one Mexican state that falls into this zone and that’s Baja California Norte. British Columbia - excluding these eastern communities: Cranbrook, Golden, Invermere, which are in the MST/MDT zone.The following are Canadian provinces and territories that use PST in winter and PDT in the summer: Oregon - Except the majority of Malheur County.Idaho - specifically the following counties: Benewah, Boner, Boundary, Clearwater, Kootenai, Latah, Lewis, Nez Perce, Shoshone, Northern Idaho.Let us begin with United States locations that observe PST in the winter and PDT in the summer:
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