Local time of any place is determined by its longitudinal location. India’s longitudinal extent varies from 68o7’E to 97o25’E. It will be cumbersome to have local time based on each longitudinal degree. Thus, to avoid the problems of poor coordination and to maintain uniformity, a standard longitudinal of 82o30’E was taken as a reference to determine the standard time of India. This longitude passes through the middle of the country with reference to its longitudinal extent. When the sun is directly overhead on this longitude, then it is assumed that it is 12 noon everywhere in India.
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