Calculate the time at following longitudes, when GMT is 3 pm:- 40 degree west 25 degree east 60-degree east 72 degree west 55 degree west
Answers
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Step 1. The earth takes 4 min to rotate through 1 degree of longitude.
Hence, the earth will take 240 minutes to rotate through 60 degrees of longitude ( 60×4)
Or the earth will take 4 hours to rotate through 60 degrees of longitude. ( 240/60)(since 1 hour=60 minutes).
Thus, we can say that the difference in time between the places lying on 60 degree east longitude and prime meridian(0 degree) is 4 hours.
Step 2: as the prime meridian lies towards the west of 60 degree east longitude, so the GMT will be 4 hours behind to the local time at 60 degree east longitude i.e. 8A.M in the morning.( 12P.M _ 4 hours)
Step3: now we need to find the difference in time between the places lying on 30 degree west longitude and prime meridian i.e.( 30×4=120 minutes or 2 hours( 120/60).
Hence, the time difference between places lying on prime meridian( 0 degree longitude) and places lying on 30 degree west longitude is 2 hours.
As the places lying on 30 degree west longitude lie towards the west of prime meridian, so the local time at 30 degree west longitude will be 2 hours behind the time at prime meridian.
Thus, the local time at 30 degree west longitude will be 6A.M in the morning ( 8A.M _ 2 hours).