Sunrise in eastern Arunachal Pradesh would be about how many hours bef

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Sunrise in eastern Arunachal Pradesh would be about how many hours before the sunrise in western Gujarat ?

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This question was previously asked in
UPSC NDA-2 – 2017
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Sunrise in eastern Arunachal Pradesh would be about two hours before the sunrise in western Gujarat.
The Earth rotates 360 degrees in 24 hours, meaning 15 degrees of longitude corresponds to 1 hour, or 1 degree corresponds to 4 minutes. The longitudinal extent of India is approximately from 68°7′ E in the west (Gujarat) to 97°25′ E in the east (Arunachal Pradesh). The difference in longitude is about 97°25′ – 68°7′ ≈ 29°18′, which is close to 30 degrees.
A difference of 30 degrees in longitude corresponds to a time difference of 30 * 4 minutes = 120 minutes, or 2 hours. Since the sun rises in the east first, the sunrise in eastern Arunachal Pradesh occurs approximately two hours earlier than in western Gujarat. India uses a single standard time (IST) based on 82.5° E longitude, which leads to this apparent time difference across the country.

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