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.
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
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.