Question

Why is 82.5 degree chosen as the standard meridian of india

Answer 1

This is because India has a wide east-west extent making it difficult to select the longitudes at the eastern or western ends as Standard meridians as this would lead to serious discrepancies between the time followed and the sun’s position in the sky. To avoid such difficulty and to have a uniform time across the country 82 30 E has been chosen as the Standard Meridian as it passes through the middle of India reducing such differences.
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Answer 2

82 degree 30 minutes  is selected as standard meridian because it lies almost in center of the India. it has prevented a lot of confusion from place to another and has brought harmony in time throughout the country.the local time at each longitutde is different so, in order to follow one timing we have accepted 82degree 30minutes as standard meridian.