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Time Zone
A TIME ZONE is a region of the globe that observes a uniform standard time for legal, commercial, and social purposes. Timezones tend to follow the boundaries of countries and their subdivisions because it is convenient for areas in close commercial or other communication to keep the same time. Most of the time zones on land are offset from Coordinated Universal Time(UTC) by a whole number of hours ( UTC−12to UTC+14), but a few zones are offset by 30 or 45 minutes (for example Newfoundland Standard Timeis UTC−03:30, NepalStandard Timeis UTC+05:45, and Indian Standard Timeis UTC+05:30). Some higher latitude and temperate zone countries use daylight saving time for part of the year, typically by adjusting local clock time by an hour. Many land time zones are skewed toward the west of the corresponding nautical time zones . This also creates a permanent daylight saving time effect
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List Of Time Zones By Country
This is a list representing TIME ZONES BY COUNTRY. Countries are ranked by total number of time zones on their territory. Time zones of a country include that of dependent territories (except Antarctic claims ). France
France
along with the United States
United States
, including its overseas territories, has the most time zones with 12. Many countries have daylight saving time , one added hour during the local summer, but this list does not include that information. The UTC offset in the list is not valid in practice during daylight saving time. SOVEREIGN STATE NO
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Lists Of Time Zones
International: * List of time zones by country – sorted by number of current time zones in the world * List of time zones by UTC offset – current UTC offsets * List of time zone abbreviations – abbreviations * List of IANA time zones – zones that have the same time since 1970 * List of military time zones Country-specific: * List of time zones by U.S. state
List of time zones by U.S. state
SEE ALSO * Category:Time by country This article includes a list of related items that share the same name (or similar names). Retrieved from "https://en.wikipedia.org/w/index.php?title=Lists_of_time_zones additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy .® is a registered trademark of the Wikimedia Foundation, Inc
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Time Zone (other)
A TIME ZONE is a region of the Earth that has adopted the same standard time. Time zone can also refer to: * Time Zone (band) , experimental hip-hop group headed by Afrika Bambaataa * Time Zone (video game) , historical video game * Timezone (video arcades) , a chain of video arcade centers based in AustraliaTime zones can also refer to: * "Time Zones" (Mad Men) , S7/E1 of Mad Men This disambiguation page lists articles associated with the title TIME ZONE. If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from "https://en.wikipedia.org/w/index.php?title=Time_zone_(other) additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy .® is a registered trademark of the Wikimedia Foundation, Inc
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Standard Time
STANDARD TIME is the synchronization of clocks within a geographical area or region to a single time standard, rather than using solar time or a locally chosen meridian (longitude) to establish a local mean time standard. Historically, the concept was established during the 19th century to aid weather forecasting and train travel. Applied globally in the 20th century, the geographical areas became extended around evenly spaced meridians into time zones which (usually) centered on them. The standard time set in each time zone has come to be defined in terms of offsets from Universal Time . In regions where daylight saving time is used, that time is defined by another offset, from the standard time in its applicable time zones
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Coordinated Universal Time
COORDINATED UNIVERSAL TIME (French : _Temps universel coordonné_), abbreviated to UTC, is the primary time standard by which the world regulates clocks and time. It is within about 1 second of mean solar time at 0° longitude ; it does not observe daylight saving time . For most purposes, UTC is considered interchangeable with Greenwich Mean Time (GMT), but GMT is no longer precisely defined by the scientific community. The first Coordinated Universal Time was informally adopted on 1 January 1960. The system was adjusted several times, including a brief period where time coordination radio signals broadcast both UTC and "Stepped Atomic Time (SAT)" until a new UTC was adopted in 1970 and implemented in 1972. This change also adopted leap seconds to simplify future adjustments
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Newfoundland Time Zone
The NEWFOUNDLAND TIME ZONE is a geographic region that keeps time by subtracting  3 1⁄2 hours from Coordinated Universal Time ( UTC ) during standard time , resulting in UTC−03:30 ; or subtracting  2 1⁄2 hours during daylight saving time . The clock time in this zone is based on the mean solar time of the meridian 52 degrees and 30 arcminutes west of the Greenwich Observatory . CONTENTS * 1 Scope * 2 Major metropolitan areas * 3 See also * 4 Sources * 5 References SCOPEThe Newfoundland Time Zone consists only of the province of Newfoundland and Labrador . Officially, the entire province is in the Newfoundland Time Zone by legislation. In practice, however, Newfoundland Time is observed only on the island of Newfoundland , its offshore islands, and southeastern Labrador communities south of Black Tickle
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Nepal Time
NEPAL STANDARD TIME (NPT) is the time zone for Nepal . With a time offset from Coordinated Universal Time (UTC) of +5:45 all over Nepal, it is one of only three time zones with a 45-minute offset from UTC. (The others are Chatham Island Standard Time , with an offset of UTC+12:45 , and the unofficial Australian Central Western Time , with an offset of UTC+08:45 .) NPT is an approximation of Kathmandu mean time , which is 5:41:16 ahead of UTC . The standard meridian passes through the peak of Gaurishankar mountain about 100 km east of Kathmandu. SEE ALSO * UTC+5:45 REFERENCES * ^ "A Brief Legal History of Time: Part One of Two". _www.bna.com_. * ^ _A_ _B_ Gurung, Trishna. "15 minutes of fame". Nepali Times. Archived from the original on 25 Jul 2011
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Indian Standard Time
INDIAN STANDARD TIME (IST) is the time observed throughout India and Sri Lanka , with a time offset of UTC+05:30 . India does not observe daylight saving time (DSTu) or other seasonal adjustments. In military and aviation time IST is designated E* ("Echo-Star"). Indian Standard Time is calculated on the basis of 82.30' E longitude , in Kakinada , (16°35′N 82°09′E / 16.58°N 82.15°E / 16.58; 82.15 ) which is nearly on the corresponding longitude reference line. In the tz database , it is represented by Asia/Kolkata
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Daylight Saving Time
DAYLIGHT SAVING TIME (abbreviated DST), also sometimes erroneously referred to as DAYLIGHT SAVINGS TIME, is the practice of advancing clocks during summer months so that evening daylight lasts longer, while sacrificing normal sunrise times. Typically, regions that use daylight saving time adjust clocks forward one hour close to the start of spring and adjust them backward in the autumn to standard time. American inventor and politician Benjamin Franklin proposed a form of daylight time in 1784. He wrote an essay "An Economical Project for Diminishing the Cost of Light" to the editor of _The Journal of Paris _, suggesting, somewhat jokingly, that Parisians could economize candle usage by getting people out of bed earlier in the morning, making use of the natural morning light instead. New Zealander George Hudson proposed the idea of daylight saving in 1895
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Nautical Time Zones
CONTENTS* 1 History of nautical time * 1.1 Establishment * 1.2 Letter suffixes * 1.3 Modern application * 2 Usage * 3 Nautical day * 4 References HISTORY OF NAUTICAL TIMEESTABLISHMENTThe establishment of NAUTICAL STANDARD TIMES, NAUTICAL STANDARD TIME ZONES and the NAUTICAL DATE LINE were recommended by the Anglo-French Conference on Time-keeping at Sea in 1917. The conference recommended that the standard apply to all ships, both military and civilian. These zones were adopted by all major fleets between 1920 and 1925 but not by many independent merchant ships until World War II. LETTER SUFFIXESAround 1950, a letter suffix was added to the zone description, assigning Z to the zero zone, and A–M (except J) to the east and N–Y to the west (J may be assigned to local time in non-nautical applications — zones M and Y have the same clock time but differ by 24 hours: a full day)
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Clocks
A CLOCK is an instrument to measure, keep, and indicate time . The word _clock_ is derived (via Dutch , Northern French, and Medieval Latin ) from the Celtic words _clagan_ and _clocca_ meaning "bell ". A silent instrument missing such a striking mechanism has traditionally been known as a TIMEPIECE. In general usage today a "clock" refers to any device for measuring and displaying the time. Watches and other timepieces that can be carried on one's person are often distinguished from clocks. The clock is one of the oldest human inventions , meeting the need to consistently measure intervals of time shorter than the natural units: the day , the lunar month , and the year . Devices operating on several physical processes have been used over the millennia. A sundial shows the time by displaying the position of a shadow on a flat surface. There is a range of duration timers, a well-known example being the hourglass
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Apparent Solar Time
SOLAR TIME is a calculation of the passage of time based on the position of the Sun in the sky . The fundamental unit of solar time is the day . Two types of solar time are apparent solar time (sundial time) and mean solar time (clock time). CONTENTS * 1 Introduction * 2 Apparent solar time * 3 Mean solar time * 4 History * 5 See also * 6 References * 7 External links INTRODUCTIONA tall pole vertically fixed in the ground casts a shadow on any sunny day. At one moment during the day, the shadow will point exactly north or south (or disappear when and if the Sun moves directly overhead). That instant is local apparent noon , or 12:00 local apparent time. About 24 hours later the shadow will again point north/south, the Sun seeming to have covered a 360-degree arc around the Earth's axis
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Sundial
A SUNDIAL is a device that tells the time of day by the apparent position of the Sun in the sky . In the narrowest sense of the word, it consists of a flat plate (the _dial_) and a _gnomon _, which casts a shadow onto the dial. As the Sun appears to move across the sky, the shadow aligns with different _hour-lines_, which are marked on the dial to indicate the time of day. The _style_ is the time-telling edge of the gnomon, though a single point or _nodus_ may be used. The gnomon casts a broad shadow; the shadow of the style shows the time. The gnomon may be a rod, wire, or elaborately decorated metal casting. The style must be parallel to the axis of the Earth\'s rotation for the sundial to be accurate throughout the year. The style's angle from horizontal is equal to the sundial's geographical latitude . In a broader sense, a sundial is any device that uses the Sun's altitude or azimuth (or both) to show the time
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Mean Solar Time
Solar time is a calculation of the passage of time based on the position of the Sun
Sun
in the sky. The fundamental unit of solar time is the day. Two types of solar time are apparent solar time (sundial time) and mean solar time (clock time).Contents1 Introduction 2 Apparent solar time 3 Mean solar time 4 History 5 See also 6 References 7 External linksIntroduction A tall pole vertically fixed in the ground casts a shadow on any sunny day. At one moment during the day, the shadow will point exactly north or south (or disappear when and if the Sun
Sun
moves directly overhead). That instant is local apparent noon, or 12:00 local apparent time. About 24 hours later the shadow will again point north/south, the Sun seeming to have covered a 360-degree arc around the Earth's axis
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Equation Of Time
The EQUATION OF TIME describes the discrepancy between two kinds of solar time . The word equation is used in the medieval sense of "reconcile a difference". The two times that differ are the apparent solar time, which directly tracks the diurnal motion of the Sun
Sun
, and mean solar time, which tracks a theoretical mean Sun
Sun
with noons 24 hours apart. Apparent solar time can be obtained by measurement of the current position (hour angle ) of the Sun, as indicated (with limited accuracy) by a sundial . Mean solar time, for the same place, would be the time indicated by a steady clock set so that over the year its differences from apparent solar time would resolve to zero. The equation of time is the east or west component of the analemma , a curve representing the angular offset of the Sun
Sun
from its mean position on the celestial sphere as viewed from Earth
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