Alaska's eastern extreme, at 130°W, lies west of this boundary. It is accentuated in the diagram because it lies directly in the middle of the U.S. The boundary between the Pacific and Yukon time zones is at 127.5°W. is centered on the meridian 75°W, extends from 67.5°W to 82.5°W, is numbered "-5" and is better known by its name "Eastern Standard Time." The center meridian of each zone is shown on the diagram together with its number and name the clocks show relative time in the eight U.S. Some time zones are named as well as numbered. The zones are numbered negatively to the west and positively to the east of Greenwich. The "zero" zone is centered on the Prime Meridian which passes through Greenwich, England it extends east to 7.5☎ and west to 7.5°W. Standard time is defined to be the same everywhere within a zone-a sharp difference of one hour exists when one moves to the next zone but minutes and seconds remain the same.Įach time zone spans 15 degrees of longitude. An international system of 24 time zones was established in 1884 to avoid the inconvenience of numerous differences in local times. Therefore, the sun appears to move at a rate of 15 degrees per hour and local time varies from place to place as one moves east or west. The earth rotates on its axis a full 360 degrees in 24 hours. The drawing summarizes the eight time zones spanned by the United States. Therefore, information on time zones is timely. The subject of time zones has once again attracted attention from the Alaska Legislature.
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