Newcomb's tables formed the basis of all astronomical ephemerides of the Sun from 1900 through 1983: they were originally expressed ( and published ) in terms of Greenwich Mean Time and the mean solar day, but later, in respect of the period 1960 – 1983, they were treated as expressed in terms of ET, in accordance with the adopted ET proposal of 1948 – 52.

In the introduction to Newcomb's Tables of the Sun ( 1895 ) the basis of the tables ( p. 9 ) includes a formula for the Sun's mean longitude, at a time indicated by interval T ( in Julian centuries of 36525 mean solar days ) reckoned from Greenwich Mean Noon on 0 January 1900:

# REDIRECT Greenwich Mean Time

It is arguably the same as Coordinated Universal Time ( UTC ) and when this is viewed as a time zone the name Greenwich Mean Time is especially used by bodies connected with the United Kingdom, such as the BBC World Service, the Royal Navy, the Met Office and others particularly in Arab countries, such as the Middle East Broadcasting Center and OSN.

Before the introduction of UTC on 1 January 1972 Greenwich Mean Time ( also known as Zulu time ) was the same as Universal Time ( UT ) which is a standard astronomical concept used in many technical fields.

Astronomers no longer use the term " Greenwich Mean Time ".

Noon Greenwich Mean Time is rarely the exact moment when the sun crosses the Greenwich meridian ( and reaches its highest point in the sky at Greenwich ) because of Earth's uneven speed in its elliptic orbit and its axial tilt.

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.

Greenwich Mean Time was adopted across the island of Great Britain by the Railway Clearing House in 1847, and by almost all railway companies by the following year, from which the term " railway time " is derived.

Ireland adopted Greenwich Mean Time in 1916, supplanting Dublin Mean Time.

The term Greenwich Mean Astronomical Time ( GMAT ) was introduced to unambiguously refer to the previous noon-based astronomical convention for GMT.

Several countries throughout the world legislatively define their local time by explicit reference to Greenwich Mean Time.

Polar expeditions may use any time zone that is convenient, such as Greenwich Mean Time, or the time zone of the country they departed from.

The Julian Day Number ( JDN ) is the integer assigned to a whole solar day in the Julian day count starting from noon Greenwich Mean Time, with Julian day number 0 assigned to the day starting at noon on January 1, 4713 BC proleptic Julian calendar.

Externally, it appears as a large white marquee with twelve 100 m-high yellow support towers, one for each month of the year, or each hour of the clock face, representing the role played by Greenwich Mean Time.

The local standard time ( adjusting for any daylight saving time or war time ) is then converted into Greenwich Mean Time or Universal Time at that same instant.

Greenwich Mean Time ( GMT ) was originally mean time deduced from meridian observations made at the Royal Greenwich Observatory ( RGO ).

Greenwich Mean Time is still the legal time in the UK ( in winter, and as adjusted by one hour for summer time ).

( See articles Greenwich Mean Time, Universal Time, Coordinated Universal Time and the sources they cite.

) Physically, the meridian of Greenwich in Universal Time is almost always to the east of the meridian in Terrestrial Time, both in the past and in the future.

* 1924 – The Royal Greenwich Observatory begins broadcasting the hourly time signals known as the Greenwich Time Signal or the " BBC pips ".

Universal Time ( UT ), a term introduced in 1928, initially represented mean time at Greenwich determined in the traditional way to accord with the originally-defined universal day ; then from 1 January 1956 ( as decided by the IAU at Dublin, 1955, at the initiative of William Markowitz ) this " raw " form of UT was re-labeled UT0 and effectively superseded by refined forms UT1 ( UT0 equalized for the effects of polar wandering ) and UT2 ( UT1 further equalized for annual seasonal variations in earth rotation rate ).

* Greenwich Time ( Greenwich, Connecticut )

As the United Kingdom grew into an advanced maritime nation, British mariners kept at least one chronometer on GMT in order to calculate their longitude from the Greenwich meridian, which was by convention considered to have longitude zero degrees ( this convention was internationally adopted in the International Meridian Conference of 1884 ).

But this practice, combined with mariners from other nations drawing from Nevil Maskelyne's method of lunar distances based on observations at Greenwich, eventually led to GMT being used worldwide as a reference time independent of location.

* February 15 – At 04: 51 GMT, French anarchist Martial Bourdin attempts to destroy the Royal Greenwich Observatory, London, United Kingdom with a bomb.

GMT either by that name or as ' mean time at Greenwich ' used to be an international time standard, but is no longer so ; it was initially renamed in 1928 as Universal Time ( UT ) ( partly as a result of ambiguities arising from the changed practice of starting the astronomical day at midnight instead of at noon, adopted as from 1 January 1925 ).

It is a modern continuation of Greenwich Mean Time ( GMT ), i. e., the mean solar time on the Prime Meridian at Greenwich, and GMT is sometimes used loosely as a synonym for UTC.

In 1928 the term Universal Time was adopted internationally as a more precise term than Greenwich Mean Time, because GMT could refer to either an astronomical day starting at noon or a civil day starting at midnight.

Greenwich Mean Time ( GMT ) was at one time based on the time observations made at Greenwich ( until 1954 ).

Analemma plotted as seen at noon GMT from the Royal Observatory, Greenwich ( latitude 51. 4791 ° north, longitude 0 °).

The Prime Meridian running through Greenwich and the Greenwich Observatory is where the designation Greenwich Mean Time, or GMT began, and on which all world times are based.

The altitude-intercept method of celestial navigation requires that the observer know exact Greenwich Mean Time ( GMT ) at the moment of his observation of the celestial body, to the second.

Then take your local time reading and subtract it from GMT ( Greenwich Mean Time ) or the time in east London.

The second marker is transmitted with an accuracy better than ± 1 ms relative to Coordinated Universal Time ( UTC ), which is itself always within ± 1 second of Greenwich Mean ( solar ) Time ( GMT ).

Note that UK Time is Greenwich Mean Time ( GMT ), with daylight-saving time observed.

Each degree of longitude east of the Greenwich meridian makes the vital moment exactly 4 minutes earlier than midnight as shown on the clock, while each hour that the local civil time is ahead of coordinated universal time ( also known as GMT ) makes the moment an hour later.

First of all there is ample area in East Greenwich already zoned in the classification similar to that which petitioner requested.

It has already been reported in your newspapers that the East Greenwich School Committee is considering additions to at least one elementary school and to the high school to insure future accommodations for a school population that we know will increase.

The `` fruitful course '' of metropolitanization that you recommend is currently practiced by the town of East Greenwich and had its inception long before we learned what it was called.

Leila ( Malia Phillips ), 25, is a Greenwich Village painter of Persianesque miniatures who has red hair that cascades almost to her ankles.

Also on the bill at the Fifty-fifth Street is a nice ten-minute color film called `` Sunday In Greenwich Village '', a tour of the haunts and joints.

* 1675 – The foundation stone of the Royal Greenwich Observatory in London, England is laid.

* Note: Botswana does not have a westernmost point as the western section is formed by the 22nd meridian of longitude east of Greenwich.

Another early reference reports that " base ball " was regularly played on Saturdays in 1823 on the outskirts of New York City in an area that today is Greenwich Village.

The state capital is Hartford, and other major cities and towns ( by population ) include Bridgeport, New Haven, Stamford, Waterbury, Norwalk, Danbury, New Britain, Greenwich and Bristol.

The southwestern border of Connecticut, where it abuts New York State, is marked by a panhandle in Fairfield County, containing the towns of Greenwich, Stamford, New Canaan, Darien and part of Norwalk.

Earth's rate of rotation must be integrated to obtain time, which is Earth's angular position ( specifically, the orientation of the meridian of Greenwich relative to the fictitious mean sun ).

It is delivered to properties in the area and available to pick up from various locations in Canary Wharf, Greenwich and the Royal Docks.

* LaGuardia Place, a street in Greenwich Village which runs from Houston Street to Washington Square, is named for La Guardia ; there is also a statue of the mayor on that street.