Q. 34.7( 3 Votes )

With the help of an atlas, find out the standard meridians of different countries and calculate their local time.

Answer :

A meridian used for determining standard time of a country is known as standard meridians. Standard meridians of different countries are given below:

*Standard meridian of Pakistan- 74 degree 22’ east longitude.


*Standard meridian of Bangladesh- 90 degree east longitude.


*Standard meridian of England- 0 degree.


*Standard meridian of Malaysia- 105 degree east longitude.


*Standard meridian of Japan- 135 degree east longitude.


*Standard meridian of India – 82 degree 30’ east longitude.


At each longitude the local time would be different. Different places having different longitude will have different local time. The time required to complete 360 degree rotation is 24 hours. The time required for the completion of one rotation is 1440 minutes. The time required for Earth to complete the rotation of 1 degree rotation is 4 minutes.


Local time of Pakistan is calculated as:


The longitudinal difference between Pakistan and India = 82 degree 30’ – 74 degree 22’


= 8 degree 8’


Time difference for 1 degree longitude is 4 minutes.


Time difference for 8 degree 8’ longitude = 8*4+1/60 *8*4


= 32.53 minutes


Hence, the time in India would be 32.53 minutes ahead of time in Pakistan.


Local time of Bangladesh is calculated as:


The longitudinal difference between Bangladesh and India = 90 degree – 82 degree 30’


= 7 degree 30’


Time difference for 1 degree longitude is 4 minutes.


Time difference for 7 degree 30’ = 7*4+1/60*30*4


= 30 minute


Hence, the time in Bangladesh would be 30 minutes ahead of time in India.


Local time of England is calculated as:


The longitudinal difference between England and India = 82 degree 30’


Time difference for 1 degree longitude is 4 minutes.


Time difference for 82 degree 30’ = 5 hours 30 minutes


Hence, the time in India would be 5 hours 30 minutes ahead of time in England.


Local time of Malaysia is calculated as:


The longitude difference between Malaysia and India = 105 degree – 82 degree 30’


=22 degree 30’


Time difference for 1 degree longitude is 4 minutes.


Time difference for 22 degree 30’ = 1 hour 30 minute


Hence, the time in Malaysia would be 1 hour 30 minute ahead of time in India.


Local time of Japan is calculated as:


The longitudinal difference between Japan and India = 135 degree- 82 degree 30’


= 52 degree 30’


Time difference for 1 degree longitude is 4 minutes.


Time difference for 52 degree 30’ = 3 hour 30 minutes


Hence, the time in Japan would be 3 hour 30 minutes ahead of time in India.


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