Answer:
The
latitudinal and longitudinal extent of the Indian main land is about 30°. Thus,
from Gujarat to Arunachal Pradesh, there is a time difference of almost two
hours. So the local time along the Standard Meridian of India (82°30' E)
passing through Mirzapur (in Uttar Pradesh) is taken as the Indian Standard
Time for the whole country.
This is near to the centre of the country and also an exact multiple of a
half hour related to Greenwich in England, which is at 0° longitude.
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