Question

What do you mean by IST ? why do we need a standard meridian ?

Answer 1

Answer:

India is a very big country. In order to maintain the uniformity of time within the country the Standard Meridian of India is taken as 82 ½ ° E longitude. ... The local time of Mirzapur near Allahabad is taken as the standard time all over India . I.S.T is 5:30 hours ahead of G.M.T (Greenwich Mean Time) located in London.

Explanation:

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Answer 2

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The time of a place depends on the longitude that passes through it. Therefore, the standard time for each country is usually taken as the time of the central meridian that passes through it.Thus, we need a standard meridian for the country. In India 82 ½ °E longitude determines the standard time.