The local time of the meridian is used for calculating the Indian standard time, Which is followed by all the places within the country. It is usually 5.1/2 hours ahead of Greenwich mean timee of the world. The 0 meridian passes through Greenwich in England. Each degree off the merieian account for 4 minutes of time and that difference between Greenwich and Indian Standard time is 82.1/2 degrees * 4= 330 minutes which is 5. 1/2 hours.
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