Question

what do you understand by standard meridian from where it passes through​

Answer 1

The meridian used for reckoning standard time; throughout most of the world the standard meridians are those whose longitudes are exactly divisible by 15°. A meridian of a map projection along which the scale is as stated.

Answer 2

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The time of a place depends on the longitude that pa-sses 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.