why is the standard time considered necessary
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because it is the time in all the places which lie in one longitude
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We calculate any place's local time by comparing and calculating the distance of longitudes between that place and the zero degree longitudinal place Greenwich city.
By applying this theory a country has several local times in it's longitudinal extent.
This time difference in a same country creates difficulties and confusion in the official works.
That's why a standard time or an average time is used as the ideal time of that country to avoid such time differences in a same country or region.
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