Question

the sun rises two hours earlier in Arunachal Pradesh as compared to Gujarat in the West but then watches shows the same time how does this happens ?
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Answer 1

Explanation:

see this:-

The watches show the same time because:

The whole of the India operates to a single time zone i.e India Standard Time ( IST). It is 5:30 hours (5 hours 30 minutes) ahead of Greenwich mean time(GMT+5.5). It is calculated on the basis of 82.30' E longitude which passes through Allahabad. So, officially there is no time lag between Arunachal Pradesh and Gujarat.

But yes, sun rises 2 hours earlier in Arunachal Pradesh in compare to Gujarat because:

Gujarat lies between 68° E and 74° E longitude and whereas, Arunachal Pradesh is located between 91.20° E and 97.30° E longitude. So, approximately both the states have 29 degree longitude difference in term of location. The time difference between each degree of longitude is 4 minutes and If we go eastward, the local time is advance by 4 minutes with each additional degree and vice versa. As, Arunachal Pradesh lies on eastern side, it will have an advance local time {29 × 4 = 116 (approximately 2 hours}. Therefore, Arunachal Pradesh is 2 hours ahead of Gujarat in term of local time.

Due to the different locations, sun not only rises but also sets two hours earlier.

Answer 2

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The latitudinal and longitudinal extent of India is about 30°. The east-west extent is smaller than the north-south extent. There is a time lag of two hours from Gujarat to Arunachal Pradesh. As Arunachal Pradesh lies to the eastern side of India, the sun rises here earlier when compared to Gujarat. The time along the Standard Meridian of India (82°30’E) passing through Mirzapu is taken as the standard time for the whole country. The latitudinal extent influences the duration of day and night, as one moves from south to north. Therefore, the watches show the same time in all the parts of the country.