Answer :

Final answer:

The central line in a time zone, which is used to define time in a zone, is known as the Standard Meridian. An extreme representation of this principle is the International Date Line, placed near the 180° longitude. This line's location is manipulated in certain areas to prevent splitting islands and territories into different calendar days.

Explanation:

The line in the middle of a time zone that, in theory, determines the time of that zone is referred to as the Standard Meridian. This system of dividing the world into 24 standardized global time zones was established by 1900. Within each time zone, all places keep the same standard time which roughly corresponds with the local mean solar time on a standard line of longitude approximately through the middle of each zone.

An extreme example of a Standard Meridian is the International Date Line, placed near the 180° line of longitude. This line is not straight and deviates in some places to avoid splitting islands and territories into different days. The International Date Line is significant as it is where the date changes by a full day when crossed.

It is crucial to note that the lines defining the time zones are not strictly defined by the geographical lines of longitude but are often modified to follow country borders or other political considerations.

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