Question

Why there is a time lag of 2hrs from Gujarat to Arunachal Pradesh

Answer 1

the local time of a place is calculated on the basis of overhead sun. the sun rises 2 hours earlier in Arunachal pradesh as compared to Gujarat in the west.

Answer 2

the sun rises in the east as sun is ahead 4 minutes every meridian while going from west to east. kuchch in gujarat is located at 6 degree 8 minutes longitude while the eastermost point of arunachal pradesh is at 97 degree 25 minutes east longitude.this is almost 30 degree longitude away from each other.does the difference is 2 hour (30×4=120 minutes/2 hours).but the local time 82 degree 32 minutes longitude is taken as the standard time throughout the country. all the watches in the country run according to the standard time.thus there is a time lag of 2 hours from arunachal pradesh to gujarat but the watches shows the correct time.