An area that observes uniform standard time for legal, commercial and social purposes are time zones. Since the earth makes one complete revolution of 360° in one day, it passes through 15° in one hour. The earth rotates from west to east, so every 15° we go eastwards, the local time is advanced by one hour. Conversely, if we go westwards, local time is retarded by one hour. Separate standard time is observed by all countries. Most countries adopt their standard time from the central meridian of their countries. The whole world has in fact been divided into 24 Standard Time Zones. Each time zones differs from the next by 15° in longitude or one hour in time. Most countries adhere to this division but due to the peculiar shapes and locations of some countries, reasonable deviations from Standard Time Zones cannot be avoided. Larger countries like U.S.A, Canada and U.S.S.R. which have great east-west stretch have to adopt several time zones for practical purposes. U.S.S.R. have eleven time zones.

Reshma Menon

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