Question

what is the longitudinal standard of india.

Answer 1

the 82.5° E longitude that is used as the reference longitude for Indian Standard Time. Indian Standard Time (IST) is the time observed throughout India, with a time offset of UTC+5:30.

Answer 2

the longitudinal extent of India is from 68* EAST longitude and 97*EAST longitude. this amount rougly to 30*.The 82.5*EAST longitude is considered as the Standard Meridian of India the local time and on this longitude is generally considered as the common time of India is known as Indian Standard Time