When it is 12 noon in India, it is 3:30 pm in japan. Since the Earth rotates on its axis once every 24 hours during which time all parts of the Earth face the sun one by one; i.e., the time is 12 noon at all places turn by turn. Such a 'time shift' takes place between many countries. Between India and Japan it is 3 hours and 30 minutes, between India and Malaysia 2 hours and 30 minutes. With the help of 'time-zone maps', we can find out the time in other countries. From these maps, we can read the time between places far apart. This is a good help, for instance,if you want to say happy birthday to your friend staying in San Francisco, but do not want to disturb him in his sleep because there it is eleven o'clock in the night, although it is 11:30 am where you reside.
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