Question

how do we decided Indian standard Time.​

Answer 1

Answer:

In military and aviation time, IST is designated E* = Echo*. Indian Standard Time is calculated on the basis of 82.5 °E longitude which is just west of the town of Mirzapur, near Allahabad in the state of Uttar Pradesh.

Explanation:

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Answer 2

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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