Diferenças entre edições de "Horário Padrão da Índia"

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[[Image:IST-CIA-TZ.png|thumb|IST em relação com as nações que fazem fronteira]]
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, apesar de a DST ter sido usada brevemente durante a [[Guerra sino-indiana|Guerra sino-indiana de 1962962]] e a [[Guerra Indo-Paquistanesa de 1965]] e [[Guerra Indo-Paquistanesa de 1971|1971]].<ref name="timez">{{cite web | url =http://wwp.india-time.com/indian-time-zones.htm | title =India Time Zones | accessdate =2006-11-25|work=[http://wwp.greenwichmeantime.com Greenwich Mean Time (GMT)]}}</ref> O tempo militar e aeronáutica, IST é designado '''E*''' ("Echo-Star").<ref>{{cite web | url = http://wwp.greenwichmeantime.com/info/timezone.htm
| title = Military and Civilian Time Designations | accessdate =2006-12-02| work=[http://wwp.greenwichmeantime.com Greenwich Mean Time (GMT)]}}</ref>
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==Criticism and proposals==
The country's east–west distance of more than 2,000&nbsp; km (1,200&nbsp; [[Mile#Statute mile|mi]]) covers over 28 degrees of longitude, resulting in the sun rising and setting almost two hours earlier on India's eastern border than in the [[Rann of Kutch]] in the far west. Inhabitants of the [[North-East India|north–eastern states]] have to advance their clocks with the early sunrise and avoid the extra consumption of energy after daylight hours.<ref name="bbc">{{cite web | url=http://news.bbc.co.uk/2/hi/south_asia/1501252.stm |title=India investigates different time zones|accessdate=2006-11-25 |last=Sen |first=Ayanjit |date=2001-08-21 |work=[http://news.bbc.co.uk BBC News]}}</ref>
 
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"></ref><ref name="thehindu2002">{{cite web|url=http://www.hinduonnet.com/mp/2002/01/07/stories/2002010700130300.htm |title=A matter of time |accessdate=2006-11-25 |last=S. Muthiah |date=2002-01-07 |work=[http://www.thehindubusinessline.com The Hindu Business Line] |publisher=[[The Hindu]] Group}}</ref>
 
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"></ref> The findings of the committee, which were presented to [[Parliament of India|Parliament]] in 2004 by the Minister for Science and Technology, [[Kapil Sibal]], did not recommend changes to the unified system, stating that "the prime meridian was chosen with reference to a central station, and that the expanse of the Indian State was not large."<ref>{{cite web|url=http://dst.gov.in/admin_finance/un-sq1007.htm |title=Standard Time for Different Regions |accessdate=2006-11-25 |date=2004-07-22 |work=Department of Science and Technology}}</ref>
 
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>{{cite web|url=http://nrcw.nic.in/shared/sublinkimages/19.htm |title=A matter of time |accessdate=2006-11-25 |work=National Resource Centre for Women}}</ref> In Assam, tea gardens follow a separate time zone known as the Tea Garden Time or Bagantime that is one hour ahead of IST.<ref name="HindustanTimes2008">{{cite web|url=http://www.hindustantimes.com/StoryPage/StoryPage.aspx?id=971215e0-8512-4ce2-805d-02592f3aab16 |title= Change clock to bagantime |accessdate=2008-09-22 |last=Rahul Karmakar |date=2008-04-13 |work=[http://www.hindustantimes.com Hindustan Times] |publisher=[[HT Media]] Group}}</ref>
Features of the Time and Frequency Standards Laboratory include:<ref>{{cite web|url=http://wwp.greenwichmeantime.com/time-zone/asia/india/time/indian-time-today.htm |title=Indian Time Today (IST) |accessdate=2006-11-25 |work=[http://wwp.greenwichmeantime.com/ Greenwich Mean Time (GMT)]}}</ref>
*Four [[caesium]] and [[rubidium]] atomic clocks;
*[[High frequency]] broadcast service operating at 10&nbsp; MHz under call sign ''ATA'' to synchronise the user clock within a millisecond;
*[[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.
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