Why is there a difference of two hours in sunrise in Arunachal Pradesh and Gujarat?

(i) The longitudinal extent of India is from 68° 7′ E to 97° 25′ E. Thus,there is difference of around 30°.
(ii) The sun takes 4 minutes to cross one degree longitude.
(iii) Therefore, 4x 30= 120 minutes i.e. 2 hours.

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