Question

when the sun rises in arunachal pradesh it is still night in gujarat why

Answer 1

Here is your answer....
This happens because of the latitudinal difference. The time changes as the latitude changes. The time zones of Gujarat and Arunachal Pradesh are different because of the latitudinal difference. This is the reason why the sun rises earlier in Arunachal Pradesh.

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Answer 2

Because Gujarat is late two hours from Arunachal Pradesh