THE LINE PASSING THROUGH GREENWICH IS CALLED PRIME MERIDIAN.
THE EARTH ROTATES AT WEST TO EAST.
SO PLACES EAST OF GREENWICH WILL BE AHEAD IN TIME FROM THAT OF GREENWICH AND THE PLACES WEST OF GREENWICH WILL BE BEHIND THE TIME THAT OF GREENWICH.
EARTH ROTATES AT 360 DEGREE IN 24 HOURS
i.e 15 DEGREE IN 1 HOUR
AND 1 DEGREE EVERY 4 MINUTES.
SO WHEN GREENWICH HAS 12 NOON,THE PLACE 15 DEGREE EAST WILL BE 15X4=60 MINUTE AHEAD OF GREENWICH THAT IS THE PLACE 15 DEGREE EAST WILL BE 1 HOUR AHEAD AND THE TIME WILL BE 1PM.
SIMILARLY,THE PLACES 15 DEGREE WEST WILL HAVE TIME AS 11AM.
SO BY THIS TECHNIQUE,THE PLACES AT 180 DEGREE EAST OF GREENWICH WILL HAVE 180X4=720 MINUTE AHEAD i.e 12 HOUR AHEAD i.e AT THAT PLACE THE TIME WILL BE 12 AT THE NIGHT.
THE EARTH ROTATES AT WEST TO EAST.
SO PLACES EAST OF GREENWICH WILL BE AHEAD IN TIME FROM THAT OF GREENWICH AND THE PLACES WEST OF GREENWICH WILL BE BEHIND THE TIME THAT OF GREENWICH.
EARTH ROTATES AT 360 DEGREE IN 24 HOURS
i.e 15 DEGREE IN 1 HOUR
AND 1 DEGREE EVERY 4 MINUTES.
SO WHEN GREENWICH HAS 12 NOON,THE PLACE 15 DEGREE EAST WILL BE 15X4=60 MINUTE AHEAD OF GREENWICH THAT IS THE PLACE 15 DEGREE EAST WILL BE 1 HOUR AHEAD AND THE TIME WILL BE 1PM.
SIMILARLY,THE PLACES 15 DEGREE WEST WILL HAVE TIME AS 11AM.
SO BY THIS TECHNIQUE,THE PLACES AT 180 DEGREE EAST OF GREENWICH WILL HAVE 180X4=720 MINUTE AHEAD i.e 12 HOUR AHEAD i.e AT THAT PLACE THE TIME WILL BE 12 AT THE NIGHT.
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