If it is 12.00 Noon in India, on which meridian will it be 7.00 am of the same day ?
7.5 degree E. Longitude
7.5 degree W. Longitude
75 degree E. Longitude
75 degree W. Longitude
Answer is Right!
Answer is Wrong!
This question was previously asked in
UPSC NDA-1 – 2021
India’s standard time (IST) is based on the meridian 82.5 degrees East longitude. The time difference between two locations is directly proportional to the difference in their longitudes, with 1 hour corresponding to 15 degrees of longitude (360 degrees / 24 hours). If it is 12:00 Noon at 82.5 degrees E, and we need to find the longitude where it is 7:00 am on the same day, the time difference is 12:00 – 7:00 = 5 hours. Since the time is earlier, the location must be to the west of India. The longitude difference is 5 hours * 15 degrees/hour = 75 degrees. Starting from 82.5 degrees East and moving 75 degrees West, we get the required longitude: 82.5 degrees E – 75 degrees = 7.5 degrees E.