What is the time lag between Arunachal Pradesh and Gujarat how is a uniform time set at all places

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• question_answer 1) 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 this happen?  

  Answer:

  From Gujarat to Arunachal Pradesh there is a time lag of two hours, but the watches show the same time because the time along the Standard Meridian of India (82° 30' E) passing through Mirzapur in Uttar Pradesh is taken as the standard time for the whole country. Because the same standard time for the whole country has been adopted, the watches show the same time in Arunachal Pradesh and Gujarat and in all parts of the country.  
  

Answer

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Hint: The time zone that is observed in India is the Indian Standard Time (IST) It does not depend on daylight or seasonal changes. The difference of longitude between Gujarat and Arunachal Pradesh is 30 degrees.

Complete Step by Step answer: There is a difference of two hours in the Local time between Gujarat and Arunachal Pradesh. This is because there is a 30 degree difference between India’s extreme east (Arunachal Pradesh) and extreme west (Guajarat). Therefore using the formula 1 degree is equal to 4 mins, hence 30 degrees is equal to 120 minutes which is 2 hours. Hence when it is 6am in Arunachal pradesh, Gujarat is 2hours behind which means it is 8am there.
The Central Government after the independence of India in 1947 established the IST for the whole country. Although cities like Kolkata and Bombay maintained their own local time till 1948 and 1955. The Tropic of Cancer crosses through India and divides the country into two parts. The Standard Meridian of India is 82°30'E . It crosses through Mirzapur in Uttar Pradesh.
The distance between the country’s east and west is 2,933 kilometres. This is the reason why the sun rises and sets 2 hours earlier in the eastern side of India. The IST is coordinated with the Greenwich Mean Time.

Note: Even though the entire country follows the time zone called the IST, while writing the answer, do not get confused between IST and write that Gujarat and Arunachal pradesh has the same timing. Note carefully the difference in longitude between them which causes the change in time between these two states.

Answer

Verified

Hint:Latitudes define the Geographic coordinates among the distance of a point North or South of the equator whereas longitude gives the Geographic coordinate of a distance of a point east to west of a Prime Meridian.

Complete answer:
Gujarat lies to the extreme west of India whereas Arunachal Pradesh is situated to the extreme east of India.The sun rises two hours earlier in Arunachal Pradesh than in Gujarat.
 If Arunachal Pradesh and Gujarat keep the local time according to the own Meridian on the globe then the people who are traveling from two different states of India, they have to keep changing their watches and hence they could not keep up to the appointments. This becomes very impractical and very problematic. To avoid such difficulties a system of standard time has been introduced. The time along Central Meridian of India which passes through Mirzapur in Uttar Pradesh is taken as the standard time for the whole country. This enables the entire country to be at the same time on watch irrespective of the position of the longitude. Therefore if we travel from Gujarat to Arunachal Pradesh the time remains the same although longitudes are different.
 There is a time lag of two hours between Gujarat to Arunachal Pradesh, due to the longitudinal extent of India.

Hence, the correct answer is option (A).

Note:Lying on different longitudes and going by calculation we have a difference of four minutes between each longitude so if we calculate the time difference between the longitudes of Gujarat and Arunachal Pradesh,the difference comes out to be one hundred twenty minutes that is two hours.

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