Question

Why the local time of longitude of 82°30'e has been taken as the indian standard time?

Answer 1

From Gujarat to Arunachal Pradesh there is a time lag of two hours
A standard longitude is taken to standardize this time lag
This is because of two main reasons:
1. It passes to the center of INDIA through mirzapur in uttar pradesh2. It is divisible by 7'30" a standard adopted by most countries round the globe