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The binary system that they suggested involved a return to British–era time zones the government rejected the recommendations adopted. In the late 1980s, a team of researchers proposed separating the country into two or three time zones to conserve energy. The country's east–west distance of more than 2,000 km (1,200 miles) covers over 28 degrees of longitude, resulting in the sun rising and setting almost two hours earlier in the north-eastern Seven Sister States than in the Rann of Kutch in the far west. The Central observatory moved from Chennai to a location near Mirzapur, as close as possible to UTC +5:30.ĭuring the Sino–Indian War of 1962 and the Indo–Pakistani Wars of 19, the government resorted briefly to daylight saving time as a way of reducing civilian energy consumption. Īfter independence in 1947, the 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. That continued until the 1940s, when the government began to broadcast time signals using the radio. In 1925, the government began relaying time synchronization through omnibus telephone systems and control circuits to organizations that needed to know the precise time. IST in relation with the bordering nations Calcutta time remained as an official, separate time zone until 1948. That came into force on January 1, 1906, also applying to Sri Lanka (then Ceylon). īritish India officially adopted the standard time zones in 1905, when picking the meridian passing east of Allahabad at 82.5° E longitude as the central meridian for India, corresponding to a single time zone for the country. They set Port Blair mean time to 49 minutes 51 seconds ahead of Madras time. The Britist colonial government established another time zone, Port Blair mean time, established at Port Blair, the capital of the Andaman and Nicobar Islands in the Bay of Bengal. By the late 1880s, many railway companies began to use Madras time (known as "Railway time") as an intermediate time between the two zones. The Conference set Calcutta time at 5 hours 30 minutes 21 seconds ahead of GMT, while setting Bombay time at 4 hours 51 minutes ahead.
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set up uniform time zones across the world, India receiving two time zones, with Calcutta using the 90th east meridian and Bombay the 75° E meridian. In 1884, the International Meridian Conference in Washington, D.C. In the 19th century, telegraph kept the clocks in synchronization– for example the railways synchronized their clocks thorough a time signal sent from the head office or the regional headquarters at a specified time every day. Local time in Mumbai (then Bombay) and Kolkata (then Calcutta), as headquarters of the two largest Presidencies of British India, assumed special importance, the nearby provinces and princely states gradually adopted the standard. Most towns in India retained their own local time until a few years after the introduction of the railways in the 1850s, when the need for a unified time zone became apparent. Time-keeping support for shipping activities in Bombay Harbour was provided by the Colaba Observatory in Bombay, which was established in 1826. daily to announce that "all was well" with IST. The clock in the observatory attached to a gun that fired at 8 p.m. That marked the first use of the current time zone, and departure from the earlier standard of the day beginning at sunrise now it started at midnight. Postulating a spherical earth, the book defined the prime meridian, or zero longitude, as passing through Avanti, the ancient name for the historic city of Ujjain () as 5 hours 30 minutes ahead of Greenwich Mean Time as the local standard time. One of the earliest descriptions of standard time in India appeared in the fourth century C.E. A clock tower at the Allahabad Observatory ( 25.15° N 82.5° E) calculates local time, though the National Physical Laboratory, in New Delhi has been entrusted with the official time-keeping devices. The longitude difference between Mirzapur and the United Kingdom's Royal Observatory at Greenwich translates to an exact time difference of 5 hours 30 minutes. Indian Standard Time calculates on the basis of 82.5° E longitude, just west of the town of Mirzapur, near Allahabad in the state of Uttar Pradesh.