![]() ![]() With the rotation of the Earth, from east to west, each meridian represents one given hour. They're technically named meridians, i.e., imaginary lines that run vertically from the North Pole to the South Pole, each 15 degrees apart. However, in a world with borders, political, geographical, social interests, and lobbies, the officially established time zones make the planet look like a complicated geometrical drawing of longitudinal lines. Ideally, the planet would be divided between 24 identical time zones, each representing one hour of the day. When you fly between Los Angeles and New York, you must add three hours to your clock upon arriving at your destination.Īnd while someone is waking and getting ready for another working day under sunny skies, another is heading off to bed under the moonlight. As a result, time is always different in various places on the planet. Welcome to the complex world of time zones. There are no Daylight Saving Time clock changes.What time is it? Here's how a common daily question can have multiple answers. India observes India Standard Time all year. ![]() This time zone was declared India Standard Time (IST) in 1947, though Calcutta Time was used until 1948 and Bombay Time until 1955. Eventually, in 1905, the meridian near Mirzapur (82☃3’E) was picked as the standard time for the whole country. In 1884 two time zones were used in India: Calcutta Time (UTC+5:53:28) and Bombay Time (UTC+4:51:20)-just over an hour apart. In 1802, British astronomer John Goldingham at the East India Company established time in Chennai as GMT+5:30. India had multiple time zones in the past. The implementation has yet to be legally formalized. In 2018, the CSIR-National Physical Laboratory (CSIR-NPL) and the National Measurement Institute (NMI) of India proposed implementing two time zones in India: IST-I (UTC+5:30) and IST-II (UTC+6:30) in the northeast. But for now, it seems like the drawbacks of one time zone do not outweigh the benefits of two. As seen from the tea gardens, early sunrise causes loss of sleep and productivity in locations with less daylight hours, and early sunset can lead to higher energy consumption. There are a few drawbacks of keeping the one time zone. ![]() Tea Garden Time, translated as “Chai Bagan Time,” was introduced by the British tea companies to increase daylight work hours and thus productivity and is still in use today. In this part of the country, sunrise can come as early as 4:00 (4 am) IST in the morning and sunset at 16:00 (4 pm) IST in the afternoon. There the clocks are unofficially set one hour ahead of IST (UTC+6:30). Tea Garden Time is an informal time zone used in India's northeastern state Assam. If the country were to base its time zones on mean solar time, it would have three time zones, but since it only has one, the Sun rises almost 90 minutes earlier in Dong in the far east than in Guar Mota in the west. It spans nearly 30 degrees longitude (68☇'E to 97☂5'E). India is a large country that stretches almost 3000 kilometers (1864 miles) from west to east. However, the UTC+5:30 offset has been used as the local standard time in India since 1906. ![]() The country has officially observed India Standard Time (IST) since 1947. Time Zone Currently Being Used in India Offset Business Date to Date (exclude holidays). ![]()
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