Chapter 2 Class 6 Geography - Latitudes and Longitudes

Why is it 5.30 p.m. in India and 12.00 noon in London?



Answer by Student

  • The prime meridian (0 degree longitude) passes through Greenwich, London, and is used as the reference point for the standard time zones. The time at the prime meridian is called Greenwich Mean Time (GMT) .

  • London is located at 0 degree longitude while the time of 82.5°E longitude is taken as the Standard time in India.

  • India is located east of the prime meridian, at about 82.5 degrees longitude. This means that time in India is ahead of London . Time difference is 4 minutes ahead every longitude towards east. (82.5 x 4 = 330 minutes or 5.5 hours). The time in India is called Indian Standard Time (IST), which is GMT + 5.5 hours.

  • Therefore, when it is 12.00 noon in London, it is 12.00 + 5.5 = 17.30 or 5.30 p.m. in India.
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