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The National Atomic Time Scale generates Indian Standard Time with an accuracy of 2.8 nanoseconds.
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The longitude of 82°30′ E has been selected as the ‘standard meridian’ of India against which the Indian Standard Time is set.
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Now Indian Standard Time is matching the International Standard Time with the accuracy range of less than 3 nanoseconds.
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CSIR-NPL (CSIR National Physical Laboratory) is the National Measurement Institute of India and authorized (by an act of Parliament) to realize and maintain the Indian Standard Time (IST).
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IST is realized at CSIR-NPL through the National Primary Time Scale consisting of a bank of ultra-stable atomic clocks.