The sun rises two hours earlier in Arunachal Pradesh as compared to Gujarat in the west but the watches show the same time. How does this happen?
Answer: The earth in its rotation covers a distance of 1° longitude in 4 minutes. The places located on different longitudes have different local times.
To keep uniform system of time, the world has been divided into 24 times zones. India has a longitudinal extent of 30 from Arunachal (east) Pradesh to Western Gujarat.
It accounts for a time difference of 2 hours. However to keep standard time across the country, 82½° E, central longitude of India, is selected as standard
meridian and local time is IST of whole country.
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