Greenwich Mean Time and International Date Line
GREENWICH MEAN TIME
In 1884, at meridian conference ,26 countries aggreed on a standard or reference IMAGINARY line called prime meridian(Greenwich Mean Time) passing through Great Britain.Greenwich is a city in Great Britain.
This was done to avoid confusion and wrong calculations of time.
Prime meridian is located at 0 degree longitude(reference).India is located 82.5 degrees east of Great Britain.
In each hour, earth rotates 15 degrees from west to east.So sunrise occurs in India first,then in Great Britain.
To calculate realtive time in India, divide 82.5 by 15 i.e. 5.5 hours. That means India's time is ahead of GMT( Britain) by 5.5 hours.
INTERNATIONAL DATE LINE (IDL)
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