Question

How do we decide Indian Standard Time?​

Answer 1

Answer:

Indian Standard Time is calculated on the basis of 82.5°E longitude in the city of Mirzapur, Uttar Pradesh, which is situated approximately on the corresponding longitude reference line.

Explanation:

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Answer 2

Indian standard time is Mirzapur in Allahabad [Prayag Raj]. The latitudal difference specifies the time. There is a time lag of 2 hours between Arunachal Pradesh and Gujrat. So, Mirzapur 82.5°E is the standard time as it lies in the middle. There is a difference of 4 minutes between each latitude.