Time Zones Explained

To effectively measure and utilize time, people worldwide would be required to identify the noon as that instance when the Sun is at its highest or crossing over the meridian. Without the use of time zones this task is almost impossible to achieve.
Considering the fact that the Earth completes its rotation at a rate of 15 degrees per hour, the Sun would be observed at its highest point at different times during the day in several countries worldwide.
The concept governing the use of time zones is affected by dividing the Earth’s surface into 24 equal sectors or zones each consisting of no more than 15 degrees, and adjusting each clock locally respective to their zones. Through this concept each country within its designated zone will be able to observe noon as that point during the day when the Sun is at its highest in the sky thus achieving a better understanding of the current time zones.
The Scottish born Canadian Sir Sanford Fleming in the 19th century proposed this theory which although was well received by his peers and other scientists would not be adapted worldwide until 1929 as one of the most vital used systems ever used.

Times zones are effectively measured by the use of a single reference point known as the Greenwich Meridian otherwise referred to as the Prime Meridian found at the Royal Observatory in England.
The time associated at this specific point is commonly known as Greenwich Mean Time, Universal Time and had in recent times been accurately called Coordinated Universal Time respective to the atomic scale. This Coordinated Universal Time zone is the reference starting point by which the local time experienced in countries worldwide are determined.
Across the world opposite the Greenwich Meridian exists the International Date line otherwise known as the IDL. This line is exactly 180 degrees in a direction of going either East or West of the Greenwich Meridian which in effect would mean that locations on either side of this line would be experienced as a different day.
Although the International Date Line passes mostly over water, it’s position has been found to easily confuse travelers who will be subjected to a change of day by simply crossing over this line. Since the introduction of time zones, the location of the International Date Line has been modified in its shape to accommodate countries for political purposes.
Thus crossing this line when traveling in an easterly direction would result in subtracting a day while crossing in a westerly direction would mean adding a day.
Travelers are often advised to check the difference in time zones prior to their departure to a foreign country, adjust their clocks accordingly and adjusting them back to their local times upon return. Several countries such as Japan and the United States have been observed as having multiple time zones which requires the adjustment of clocks while traveling within those countries when crossing time zones.
One confusion experienced by travelers to date includes the transitions experienced respective to Daylight Savings Time which requires the changing of local clocks by advancing the current time during specific months to make the most of the daylight experienced during the summer seasons.