Greenwich Information

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Visit Greenwich In London

  1. Old Royal Naval College
  2. The Queens House
  3. The National Maritime Greenwich 
  4. Discover Greenwich
  5. Cutty Sark Tea Clipper
  6. The Royal Observatory
  7. Greenwich Royal Park

Greenwich Meantime (GMT) Greenwich Meridian Line Restaurants, Pubs, & Coffee Shops In Greenwich Places To Stay (Hotels, B&Bs, etc…) Entertainment In Greenwich Find a home in Greenwich London Greenwich Education, Schools, Colleges & University

  1. Trinity Laban Conservatoire of Music & Dance
  2. Greenwich University
  3. Primary Schools
  4. Secondary Schools
  5. Nursery & Reception Schools

Movies Filmed In Greenwich Add your listing: [directory_register] [go_pricing id=”gil_pricing_1_copy_872013″] Places To Visit

Greenwich Information – The Old Royal Navy College is a masterful centrepiece of architecture in Maritime Greenwich.  Designed by Christopher Wren the Navy College is a World Heritage site described by the United Nations Educational, Scientific and Cultural Organisation (UNESCO) as being of “outstanding universal value” and the “finest and most dramatically sited architectural and landscape ensemble in the British Isles”.

Where Is The Time Zone GMT

Greenwich Time - Royal Observatory

The Time Zone for GMT (Greemwich Meantime) is in Greenwich in London, England.  Greenwich in London has been the home of Greenwich Mean Time (GMT) since 1884.  GMT is sometimes called Greenwich Meridian Time because it is measured from the Greenwich Meridian Line which is at the Royal Observatory in Greenwich.  Greenwich is the place from where all time zones are measured across the world.  Read More

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What Is GMT?

Greenwich Observatory

What is Greenwich Meantime (GMT) and how does it Relate to World Time?

GMT or Greenwich Mean Time is usually used for Coordinated Universal Time (UTC). It does not take into account the precise accuracy on the basis of fractions of a second. Usually, most people refer to GMT as a term which can be interchanged with UTC. However, there are some differences between these two concepts. In this article, we will tell you everything about Greenwich Mean Time and its relation to other world time zones.Greenwich Park ObservatoryGMT – An Overview

In 1884, Greenwich Mean Time was adopted as the world’s standard time. This happened during the Washington Meridian Conference. During this conference, Universal Time was also established. Universal Time gave rise to the international 24-hour time zone system. As a result, every time zone refers back to GMT on the prime meridian. Since the 19th century, prime meridian at Greenwich, England has served as the line of reference for GMT. The time of time of this city is taken as a reference for the whole world. The time of other cities of the world only calculated related to the time of this city.

At first, Greenwich Mean Time was calculated as per the 24-hour clock, beginning at noon. However, the scenario changed in 1925, when the day of GMT was considered to start at midnight. After a while, GMT Greenwich Time zone was renamed to Universal Time (UT). Sometimes, it is also referred as UT0. On the other hand, t is called UT1 when irregular movements of terrestrial poles are taken into account. Also known as Chandler Wobble, this happens because Earth’s poles never spin in a straight line.

Development of Different Time Systems

UT1 was followed by the formulation of a new concept. This one was known as UT2. It aimed to correct certain seasonal variations to give precise and accurate time. With the development of mechanical clocks, Atomic Time came into existence.

There are many different time services around the world. Their combined mean version is used as International Atomic Time (TAI). This one is the international atomic time scale. It is based on many different atomic clocks. However, unlike UT1, developed from GMT, it does not take into account the Earth’s rotation. As a result, one more standard for civil time is Coordinated Universal Time (UTC).

Development of UTC

The difference between UTC and TAI are important seconds.  If you add or subtract seconds from TAI, it results in UTC. This difference is also known as a leap second.  A leap second is measured by an atomic clock, and added to or subtracted from UTC, to make it similar to astronomical time within 0.9 second.  All the timing centres in the world like to keep their timescales synchronised with UTC. Therefore, all these scales are known as Coordinated Universal Time.

Usually, GMT is often called UTC.  However, this reference means UT1.  Since 1972, UTC has been the universal time broadcast by radio stations around the globe.  Popularly, it is known as GMT Greenwich Mean Time zone.  UTC is unofficially known as Zulu Time.   It is also used in aviation to avoid any confusion between time zones and daylight saving time.

Some Other Time Systems

Astronomers also used other time systems to measure time. Some popular examples include:

Terrestrial Dynamical Time
Ephemeris Time
Terrestrial Dynamical Time (TDT) is 32.184 seconds ahead of TAI. Terrestrial Dynamical Time is also called Terrestrial Time (TT). It has a unit of duration 86400 SI seconds. Astronomers use TDT to calculate planetary positions with respect to the Earth’s center. The difference between UT1 and TDT is known as Delta T. TDT was first used in 1984. Prior to TDT, astronomers used Ephemeris Time (ET) to gather information about planetary positions. Ephemeris Time was the closest approximation before atomic clocks. It helped astronomers keep a track of planetary positions and motions.

Other important time systems in the world include :

Barycentric Dynamical Time (TDB)
Barycentric Coordinate Time (TCB)
Sidereal Time
Geocentric Coordinate Time (TCG)

GMT Greenwich Time zone is recognized by people all across the globe. Over time, people have come to adopt this system as a standard for civil time. However, other time zones mentioned in the article are also equally important for different purposes. Understanding how different time zones work will give you a better idea about their purpose and functioning. The standard Greenwich clock is located at the Royal Observatory in Greenwich, England.


Greenwich In London is a local listing site for Greenwich businesses, services, places to stay, shopping, attractions and more.  A useful destination for both residents and visitors to find what they are looking for in and around the Greenwich area.

Greenwich & Canary Wharf

About Greenwich

The Royal Borough of Greenwich is famous for Greenwich Mean Time where the 0’0’00” meridian line starts the world’s time.  A beautiful location filled with world heritage sites, Greenwich in London is situated in South East London on the south side of the Thames River.  Starting in zone 2, Greenwich is only two train stops from London Bridge and a few DLR stops from the Canary Wharf financial district.  5.5 miles (8.9km) south east of Charing Cross, Greenwich attracts visitors and tourists from around London and the world.

One of the foremost locations for the 2012 London Olympics, Greenwich is filled with historical attractions and boasts some of the most spectacular architecture in London.  Whether a local or a tourist there is plenty do from visiting the Cutty Sark, National Maritime Museum, and Royal Observatory, to wandering the beautiful Greenwich Park grounds, shopping in the market, and more.  A great place for families, the borough has some of the best entertainment and options for a day out in London.

A great mix of classic and modern, Greenwich in London is surrounded by a mix of traditional buildings as well as new and modern developments.   In the heart of Greenwich you will find the Royal Naval College, National Maritime Museum, Queens House, and the University set within the beautiful grounds over-looking the Thames River, Canary Wharf and the 02 Arena.

Still capturing the essence of historical, maritime London, England, the grounds around the park, university and naval college have become a popular location for Hollywood with films including Thor Dark World (2013), Pirates of The Caribbean: On Stranger Tides (2011), The Wolfman (2010), Four Weddings and a Funeral (1994) and many more.

Whether you are looking to take in some art, culture and history, enjoy a riverside stroll, relax in the park, enjoy some food and a local pint, or have a quiet tea or coffee, Greenwich offers a fantastic range of options for the whole family.

A short ride on the train, bus or river boat to and from central London (Zone 1), Greenwich offers fantastic surroundings, facilities, accommodation, attractions, and activities for residents, businesses and visitors.