What does GMT mean?

Question

Its full-form is Greenwich Mean Time...but what does it signify?

Answer 1

Greenwich Mean Time (GMT)

http://wwp.greenwichmeantime.com/

Answer 2

"Greenwich Mean Time" (GMT) is a term originally referring to mean solar time at the Royal Observatory, Greenwich in England. It is now often used to refer to Coordinated Universal Time (UTC) when this is viewed as a time zone, although strictly UTC is an atomic time scale which only approximates GMT in the old sense. It is also used to refer to Universal Time (UT), which is the astronomical concept that directly replaced the original GMT.

Noon Greenwich Mean Time is not necessarily the moment when the Sun crosses the Greenwich meridian (and reaches its highest point in the sky in Greenwich) because of Earth's uneven speed in its elliptic orbit and its axial tilt. This event may be up to 16 minutes away from noon GMT (this discrepancy is known as the equation of time). The fictitious mean sun is the annual average of this nonuniform motion of the true Sun, necessitating the inclusion of mean in Greenwich Mean Time.

Historically the term "GMT" has been used with two different conventions for numbering hours. The old astronomical convention (before 1925) was to refer to noon as zero hours, whereas the civil and more modern convention is to refer to midnight as zero hours. The more specific terms "UT" and "UTC" do not suffer this ambiguity, always referring to midnight as zero hours.

Time zone
Although civil time, e.g., the Greenwich Time Signal in the United Kingdom, is now based on UTC, it is still popularly called GMT. It is also called Western European Time (WET).

Those countries marked in dark blue on the map above use European Summer Time and advance their clock one hour in summer. In the United Kingdom, this is known as British Summer Time (BST); in the Republic of Ireland it is called Irish Summer Time (IST). Those countries marked in light blue keep their clocks on UTC/GMT/WET year round.

You could get more information from the link below...

Answer 3

It's the time by the sun (noon is when the sun is highest) on the Greenwich meridian, 0 degrees. It is the time called Z (Zulu)

During the winter time it is the time used in England

Answer 4

Greenwch Mean Time.The Worlds time is related to this time .Hence G.M.T. plus 2 etc.Greenwich is in London.The clock is in the Greenwich Observatory.Visit this area it is on The Thames.A really old town with a lot of history.The Cutty Sark a very old ship is in dry dock there.

Answer 5

London Time

Answer 6

It is the basis time line for measuring time around the world. The zero hour and 24 hour time lines are the GMT.

Answer 7

In grenwich england, it is considered 0 time, so all the time zones are built around that one. Like in the midwest in illiinois, it is like -700 or something, so 7 hours time difference earlier. As you move east, it becomes +100 etc.. Like the standard for all the times around the world.

Answer 8

It is used as the standard time through out the world .
the 0 degree latitude passes through greenwhich in London
and using this we can find the time of any time zone

Answer 9

actually a latitude/ longitude passes thro greenwich island....with that as reference point the timings are calculated...n hence...

Answer 10

time in london