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Why is it 5 :30 p.m in India and 12 :00 noon in London ?

1.In London the time of Greenwich mean time (GMT) is followed and in India we follow Indian standard time (IST) located at 82030' East of the Prime meridian.Therefore India is 5 hours 30 minutes ahead of London.
2.This can be calculated with the help of following concept : Earth takes 4 minutes to cover 1 degree longitude.
Hence to cover 82030' or 82.50,Earth will take 82.5 ×4 =330 minutes or 5 hours 30 minutes.
3.Thus If it is 12:00 noon in London, in India it will be 5:30 p.m.

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In London, the Greenwich Mean Time (GMT) is followed. The Indian Standard Meridian is located 82½east of the Prime Meridian. Thus the Indian Standard Time (IST) is 5 hours and 30 minutes ahead of GMT. So, when it is 12 noon in London, it is 5.30 P.M. in India

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THIS IS BECAUSE LONDON AND INDIA IS LOCATED ON DIFERENT LATITUDES IE. INDIA LIES ON 75: DEGREE EAST AND LONDON LIES ON7; WEST (GREEN WICH WICH IS SITUATED IN LONDON LIES ON 0: DEGREE). FOR eg. DIFFERENCE BETWEEN THE TIME OF 1: DGREE EAST LATITUDE AND 2: EAST LATITUDE IS 4 MINUTES. SO 75+7=82/4=5.4666666 APPROXIMATELY 5HRS 30 MIN

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