Question : How many minutes for each degree of longitude does the local time of any place vary from the Greenwich time?
Option 1: two minutes
Option 2: four minutes
Option 3: six minutes
Option 4: eight minutes
Correct Answer: four minutes
Solution : The correct answer is four minutes.
Change of one degree longitude corresponds to 4 minutes from Greenwich meridian line. Earth takes 24x60 minutes to complete one revolution and it is divided into 360 longitudes. So from dividing this we get the figure of 4 minutes.
So with the 1 degree change in longitude from the greenwich meridian line time increases by 4 minutes or we can say that if we move 15 degree longitude time changes with 1 hour.
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