The time of each place according to its longitude is called the local time can be determined precisely by the sun’s overhead position. This time the sunlight can tell exactly. The local time is related to the height of the mid – day sun. From this, on the same longitude, all cities in the North – South have the same time. So there is no difference in their local time. The cities located in the East – West will be on different meridian lines. For this reason they will have different times. This is the reason that the local time of the cities located in the East – West have a natural difference. Local time is always in accordance with the midday sunlight.