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India - Size And Location
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 it happen?
India has a longitudinal extent of 30°. Due to this there is a time lag of two hours between the sunrise on the easternmost and the westernmost horizons of India. Due to rotation, the earth takes 4 minutes to rotate through 1° of longitude. The difference in time is one hour for 15° of longitude. Therefore, for a longitudinal extent of 30° of India, there is a time lag of 2 hours.
When it is 6 a.m. in Arunachal Pradesh, it is still 4. a.m. in Gujarat. But the watches in all parts of India are run according to standard time measured from 821/2°E longitude.
So, the watches in Arunachal Pradesh and Gujarat show the same time despite the different sunrise.
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