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Indian Standard Time is calculated along a line of longitude passing through
1. 82°30' E passing through Allahabad
2. 80°30' E passing through Delhi
3. 88°30' E passing through Kolkata
4. 84°00' E passing through Nasik

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Correct Answer - Option 1 : 82°30' E passing through Allahabad

The correct answer is 82°30' E passing through Allahabad.

  • India has a time zone, with a UTC + 5:30 time offset.
  • Indian Standard Time (IST) is calculated on the basis of 82.5 degrees east longitude from the clock tower which is in Mirzapur, Uttar Pradesh.
  • The Standard Meridian of India is 82°30'E at Mirzapur in Uttar Pradesh was taken as the standard Meridian because it splits the country into closely two equal parts.
  • It is situated approximately on the corresponding longitude reference line.
  • It is also called as Standard Meridian of India and it passes through Uttar Pradesh, Madhya Pradesh, Chhattisgarh, Orissa, and Andhra Pradesh.
  • The distance of India from west to east is 2,933 kilometers and in terms of longitude, it is between 68.7 degrees east to 97.25 degrees east.
  • Gujrat is bordered on the west and Arunachal Pradesh on the east and has a great difference in sunrise timing along East in Gujrat and West in Arunachal Pradesh.
  • There is a difference of 29º longitude between these two thus sun rising and setting time is approximately two hours earlier in the eastern states as compared to Gujarat in the west.

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