Question

What is mean by IST and why do standard meridian ?

Answer 1

hello!

IST=Indian Standard time
a time that is followed as a standard time all over India. It is the time of a certain meridian of longitude that passes almost through the middle of India near Allahabad.

standard meridian= it is the particular meridian that is followed all over the country in concern.

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.