Horário Padrão da Índia: diferenças entre revisões
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O ''Indian Standard Time'' é calculado no observatório de [[Allahabad]], que está situado a 82.5°E do [[Meridiano de Greenwich]], sendo adotada uma diferença de 5 horas e 30 minutos com relação ao [[Tempo Universal Coordenado|horário oficial de Greenwich]] (''[[Greenwich Mean Time]]'', GMT).
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O '''Horário Padrão da Índia''' ('''IST''') é o [[fuso horário|horário]] observado em toda [[Índia]] e [[Sri Lanka]], com um [[time offset]] de [[UTC+5:30]]. A Índia não observa [[horário de verão]] (DST) ou outros ajustes sazonais, [[Guerra sino-indiana|962]] e a [[Guerra Indo-Paquistanesa de 1965]] e [[Guerra Indo-Paquistanesa de 1971|1971]].<ref name="timez">{{citar web | url =http://wwp.india-time.com/indian-time-zones.htm |
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Indian Standard Time is calculated on the basis of 82.5° E [[longitude]], from a clock tower in [[Mirzapur]] ({{Coord|25.15|N|82.58|E|}}) (near [[Allahabad]] in the state of [[Uttar Pradesh]]) which is nearly on the corresponding longitude reference line.<ref name="two-timing">{{citar web|url=http://www.hindustantimes.in/StoryPage/Print.aspx?Id=7ae0f1f1-23fd-4e46-98f2-3e0933e87f9f |
In the [[tz database]] it is represented by [[Asia/Kolkata]].
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{{Main|Time in India}}
After [[Indian independence movement|independence in 1947]], the [[Government of India|Indian government]] established IST as the official time for the whole country, although Kolkata and Mumbai retained their own local time for a few more years.<ref name="Princely states">{{citar web|url=http://www.irfca.org/faq/faq-misc.html |
During the Sino–Indian War of 1962 and the Indo–Pakistani Wars of 1965 and 1971, daylight saving was briefly used to reduce civilian energy consumption.
==Criticism and proposals==
The country's east–west distance of more than 2,000
In the late 1980s, a team of researchers proposed separating the country into two or three time zones to conserve energy. The binary system that they suggested involved a return to British–era time zones; the recommendations were not adopted.<ref name="bbc"
In 2001, the government established a four–member committee under the [[Department of Science & Technology (India)|Ministry of Science and Technology]] to examine the need for multiple time zones and daylight saving.<ref name="bbc"
Though the government has consistently refused to split the country into multiple time zones, provisions in labour laws such as the ''Plantations Labour Act, 1951'' do allow the Central and State governments to define and set the local time for a particular industrial area.<ref>{{citar web|url=http://nrcw.nic.in/shared/sublinkimages/19.htm |
==Time signals==
Official time signals are generated by the [[Time and Frequency Standards Laboratory]] at the National Physical Laboratory in New Delhi, for both commercial and official use. The signals are based on [[atomic clock]]s and are synchronised with the worldwide system of clocks that support the [[Coordinated Universal Time]].
Features of the Time and Frequency Standards Laboratory include:<ref>{{citar web|url=http://wwp.greenwichmeantime.com/time-zone/asia/india/time/indian-time-today.htm |
*Four [[caesium]] and [[rubidium]] atomic clocks;
*[[High frequency]] broadcast service operating at 10
*[[Indian National Satellite System]] satellite–based standard time and frequency broadcast service, which offers IST correct to ±10 microsecond and frequency calibration of up to ±10<sup>−10</sup>; and
*Time and frequency calibrations made with the help of [[picosecond|pico–]] and [[nanosecond]]s time interval [[frequency counter]]s and [[phase (waves)|phase]] recorders.
IST is taken as the standard time as it passes through almost the centre of India. To communicate the exact time to the people, the exact time is broadcast over the state–owned [[All India Radio]] and [[Doordarshan]] television network. Telephone companies have dedicated phone numbers connected to [[mirror (computing)|mirror]] [[timeserver]]s that also relay the precise time. Another increasingly popular means of obtaining the time is through [[Global Positioning System]] (GPS) receivers.<ref>{{citar web|url=http://pib.nic.in/release/rel_print_page.asp?relid=19703 |
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==Ver também==
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