Time zones would be the best way to pick the time and date for that countries around the globe. In order to precisely measure and rehearse time, everybody in the world would like to choose the noon as the time of which sunshine is a its highest time the sky or if this crosses the meridian. This really is impossible without knowing enough time zones. As the earth rotates at 15 degrees every hour, the sun is at its highest point in the sky at different times from the day many different countries world wide.
Enough time zones are decided based on the proven fact that the planet could be put into 24 zones, 15 degrees each. The one who proposed it was Sir Sanford Fleming, a Scottish-born Canadian, from the late 1800s. Although well-accepted by the scientific community all over the world, this product was instituted worldwide only in 1929, the main system in the modern world. Time zones are a solution to complex geographic dependence, but still allowing local time to approximate the mean solar time.
Earlier enough time zones were specified based on a point called Greenwich Meridian or Prime Meridian, which is in the Royal Observatory, Greenwich, England. Quite simply the Greenwich Mean Time, which has been established in 1675. Prior to standardization of energy zones people used solar time, this a drawback that each place were built with a different time according to their geographical location. As a way to possess a better calculations, in recent times Coordinated Universal Time is followed. Coordinated Universal Time is founded on an atomic time scale. In case a countries time is UTC+5, it means any time its noon in Greenwich, its 5 pm because country.
Another important factor for Time zone is the International Date Line. International Date Lines are an imaginary line at 0° longitude around the opposite side worldwide from the Prime Meridian. International Date Line was never an upright line, this has been zig zagged to prevent confusion before some countries, and also plus there is some practical difficulties still lingering round. This will influence the travelers across the globe. If someone crosses this line from west on the east per day is subtracted, if crossed from east to the west each day is added.
Usually the timezones differ by 1 hour. Even you can find countries worldwide who have an offset time zone like India, Nepal in which the time zone is different from 30 minutes to quarter-hour.
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