What is meant by Indian Standard Time ?Why do we need a standard meridian?
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Indian Standard Time (IST) is the time zone observed throughout India, with a time offset of UTC+05:30. ... Indian Standard Time is calculated on the basis of 82.30′ E longitude in the city of Mirzapur, Uttar Pradesh, which is situated approximately on the corresponding longitude reference line.
The time of a place depends on the longitude that passes through it. Therefore, the standard time for each country is usually taken as the time of the central meridian that passes through it. ... Thus, we need a standard meridian for the country
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Indian standard time is the uniform time calculated by the Standard Meridian of India. It is called as IST.
(i) India is a large country, almost 30 degrees are passing from westernmost state to easternmost state Arunachal Pradesh.
(ii) Due to that, here is a difference of two zones.
(iii) To avoid confusion or chaos for having different timings in different states of India, one standard meridian is taken to have a uniform time for the entire country.
(iv) Therefore, at 82°30'E has been taken as standard meridian of India which is almost passing from centre of India.
The time applicable allover India is Indian Standard Time.
To avoid time gap of two hours between east and west part of
India which may create confusion in working, it is essential to have a Standard Meridian.
Indian Standard Time (IST) is the time zone observed throughout India, with a time offset of UTC+05:30. India does not observe daylight saving time or other seasonal adjustments. In military and aviation time IST is designated E* ("Echo-Star").[1]
Indian Standard Time is calculated on the basis of 82.30′ E longitude in the city of Mirzapur, Uttar Pradesh, which is situated approximately on the corresponding longitude reference line
After independence in 1947, the Indian government established IST as the official time for the whole country, although Bangalore and Mumbai retained their own local time (known as Calcutta Time and Bombay Time) until 1948 and 1955, respectively.[3] The Central observatory was moved from Chennai to a location at Shankargarh Fort in Prayagraj district, so that it would be as close to UTC+05:30 as possible.[citation needed]
Daylight Saving Time (DST) was used briefly during the China–India War of 1962 and the Indo-Pakistani Wars of 1962 and 1971.[4]
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 clocks and are synchronised with the worldwide system of clocks that support the Coordinated Universal Time.
Features of the Time and Frequency Standards Laboratory include:
High frequency broadcast service operating at 10 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 ±10−10; and
Time and frequency calibrations made with the help of pico- and nanoseconds time interval frequency counters and 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 national All India Radio and Doordarshan television network. Telephone companies have dedicated phone numbers connected to mirror time servers that also relay the precise time. Another increasingly popular means of obtaining the time is through Global Positioning System (GPS) receivers.
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