Coordinated Universal Time - UTC

UTC Time or Coordinated Universal Time.     This UTC Time Clock displays the current Coordinated Universal Time or UTC  now. UTC is also called GMT or Greenwich Mean Time as well. UTC is used as the reference time from which each country depending on its time zone will keep a constant difference of time from UTC time. The aim is that all over the world people wake up by day and go to sleep by night. Some countries like Guinea, Burkina Faso, Morocco etc maintain UTC + 00:00 hours or UTC itself as their local time which means their UTC offset is zero or in other words, their local time is same is Coordinated Universal Time or UTC.

Time Zone UTC Offset.    The earth is divided into 360 longitudes and 180 latitudes each of which is running from the north pole to the south pole. The longitudes are taken as 180 clockwise to east of zero degree longitude when seen from on top of earth's north pole and another 180 longitudes anticlockwise from the zero degree longitude.  The 180 degrees clockwise are denoted with an E put next to it and the 180 longitudes west of the zero degree longitude are denoted with the letter W is placed with it.

Similarly the latitudes are transverse sections of the earth perpendicular to the earth's poles. The center latitude is called Equator or the zero degree latitude. The 90 latitudes start from equator towards north pole denoted with a letter N and those southwards of equator are denoted with S. Depending on the longitudes between which a country or its part is situated, a time offset from the UTC is given to that place. About 15 degree longitudes denote approximately one hour time.

Thus the farther the place or country is from the zero degree longitude, the more will be the offset time from UTC for that country. Some countries are so big that they have many different times being maintained in the same country. Examples are USA, Russia, France etc.

UTC or GMT.    The UTC or Co-ordinated Universal Time was adobpted on 01 Jan 1972. The Coordinated Coordinated Universal Time (UTC) and Greenwich Mean Time are almost the Same but not has a little time difference between them. The GMT was adopted in the year 1847. The zero degree longitude passes through Greenwich in London. The world was initially using GMT or the Mean Solar Time in the Royal Observatory in Greenwich as the international civil time standard. But now the world has changed over to Zulu Time or Coordinated Universal Time (UTC).  GMT was the mean of all the times throughout the year when the sun was at its apex over the Greenwich. The time of the day when the sun was at its apex due to the earths elliptical orbit and oblong shape could vary upt to plus or minus 16 minutes throughout the year. Thus GMT was an average of this figure which was not accurate for most practical purposes.

Astronomers took the time of date change at noon those days at Greenwich. But for everyone else the date changes at mid night. So why did astronomers want it at noon? Very simple. They wanted that whatever observations they made throughout one night stays as one date. If date changes by midnight then their observations will be half in one date and the rest in next date during the same night. To avoid this they wanted the dates changed at mid day.

The UTC is the modern form of GMT. In the Coordinated Universal Time and the GMT could be in variance by about 0.9 seconds. But the UTC is much more precise and accurate for most of the modern day technology depending on time like your atomic clocks, GPS etc. Hence Coordinated Universal Time has become the modern day standard reference time.


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