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Why the local time of longitude of 82°30'E has been taken as the Indian Standard Time

India is located in the northern hemisphere. The Tropic of Cancer (23°30'N) passes almost halfway through the country. From south to north, main land of India extends between 8°4'N and 37°6'N latitudes. From west to east, India extends between 68°7'E and  97°25'E longitudes. If we divide the world into eastern and western hemispheres.India belong to great longitudinal extent of about 29°, there could be a wide differences in local time of places located at two extreme points of India. As such, the difference between these two points would be of about two hours. As you have learnt earlier, the local time changes by four minutes for every one degree of longitude. The sun rises about two hours earlier in the east (Arunachal Pradesh) than in the west (Gujarat).That's why the local time of longitude of 82°30'E has been taken as the Indian Standard Time.
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