Question

what is mean by Indian standard time why do we need Standard Meridian in India

Answer 1

The longutdinal extent of India is 30 degrees. The Sun takes 4 minutes to travel the distance between every degree of longitude. So, it takes 2 hours for the Sun to rise in Gujarat after it has risen in Arunachal Pradesh. This gives rise to confusion regarding the local time. To avoid confusion, and to have one standard time for the country, the standard meridian is chosen along 82degrees 50'E.

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.