UPSC Prelims 1999·GS1·geography·indian geography

If it is 10.00 a.m. I.S.T., then what would be the local time at Shillong on 92°E longitude?

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Last updated 23 May 2026, 3:31 pm IST
  1. A9.38 a.m.
  2. B10.38 a.m.Correct
  3. C10.22 a.m.
  4. D9.22 a.m.

Explanation

To find the local time at Shillong, follow these steps: 1. Identify the difference in longitude: Indian Standard Time is calculated based on 82.5 degrees East longitude. Shillong is located at 92 degrees East. The difference between the two is 9.5 degrees (92 minus 82.5). 2. Calculate the time difference: The Earth rotates 1 degree every 4 minutes. Therefore, a 9.5 degree difference equals 38 minutes (9.5 multiplied by 4). 3. Determine the direction: Since Shillong is further East than the IST meridian, its local time will be ahead of IST. 4. Adjust the time: Add 38 minutes to the IST of 10.00 a.m. This results in a local time of 10.38 a.m. Therefore, option B is correct.
geography: If it is 10.00 a.m. I.S.T., then what would be the local time at Shillong on 92°E longitude?
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