Time zones arose as a concept when humans wanted to be able to state the amount of daylight available as per their local weather conditions and timeline. Timelines have been established around the position of the sun in the sky. As per the sun’s position in the sky, whether in the highest point in the sky or at other positions the time of the day was ascertained, whether it is middle of the day or high noon.
The perception of the time of day differs in different parts of the world as the sun appears at the highest point in the sky in a certain time of day in a certain country or in different parts of a continent like the front or center of the US. Time zones were set in order to provide a ready solution to this need.
The prime meridian is the starting point as agreed internationally based around which time zones are fixed. Greenwich Mean Time is what it is referred to, which signifies the universal standard time. It is the point zero base from where all time zones are calculated which are a certain number of hours behind or ahead of this universal time. This is taken as the basic standard and zones are established at fifteen-degree slices around the world accordingly. The use of fifteen degrees is an acceptable medium which was first established in the later part of the 19th century. As per this basis, there are 24 divisions that exist across the world.
The starting point which fixes the order of time zones remains same through the facility that resided at the median or location does not exist anymore. This was the famous Greenwich Observatory, which was moved during the fifties to Sussex in England. However, the original site’s coordinates are considered to be prime meridian for all official and calculation purposes.
Some time zones do shift during autumn or spring time of the year, but the function and process remain the same. Today interaction with distant locations has become more and more common and the time zones become a constant reference factor, whether one is communicating with others for business or for pleasure.