Time zones would be the sole method to pick the time and date for your countries of the world. To be able to precisely measure and make use of time, everybody in the world would like to determine the noon because time from which the sun is at its highest time the night sky or if it crosses the meridian. This can be impossible with no knowledge of some time zones. Because earth rotates at 15 degrees every hour, the sun reaches its highest time the night sky at different times inside the day for several countries world wide.
Some time zones are decided based on the fact that the entire world can be put into 24 zones, 15 degrees each. The one that proposed this is Sir Sanford Fleming, a Scottish-born Canadian, within the late 1800s. Although well-accepted with the scientific community around the globe, this method was instituted worldwide only in 1929, the key system of the modern world. Timezones really are a solution to complex geographic dependence, but still allowing local time to approximate the mean solar time.
Earlier the time zones were specified based on a point called Greenwich Meridian or Prime Meridian, that’s in the Royal Observatory, Greenwich, England. It’s known as the Greenwich Mean Time, that was established in 1675. Prior to standardization of energy zones people used solar time, this had a drawback that all place had a different time according to their physical location. So that you can use a more accurate calculations, lately Coordinated Universal Time is followed. Coordinated Universal Time is founded on an atomic time scale. In case a countries time is UTC+5, this means that whenever its noon in Greenwich, its 5 pm in this country.
Another important factor for Time zone may be the International Date Line. International Date Line is an imaginary line at 0° longitude for the opposite side of the world through the Prime Meridian. International Date Line wasn’t an upright line, this has been zig zagged to prevent confusion in time for some countries, as well as then there is some practical difficulties still lingering round. This may impact the travelers throughout the world. If a person crosses this line from west on the east a day is subtracted, if crossed from east on the west every day is added.
Normally the timezones differ by one hour. Even you can find countries around the globe which may have an offset time zone like India, Nepal where the time zone is different around 30 minutes to quarter-hour.
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