Greenwich mean time

Home > ... > Science and Technology > Astronomy and Space Exploration > Astronomy: General > ...

Essential reading Compare
side-by-side A Dictionary of Astronomy The Oxford Essential ... The Columbia Encyclopedia, ...

Greenwich mean time

Greenwich mean time or Greenwich meridian time (GMT), the former name for mean solar time at the original site of the Royal Observatory in Greenwich, England, which is located on the prime meridian . In 1925 the numbering system was changed to make GMT equivalent to civil time at the prime meridian, and in 1928 the International Astronomical Union changed the designation of the standard time of the prime meridian to universal time (UT), which is now in general use.

Create a link to this page

Copy and paste this link tag into your Web page or blog:

<a href="http://www.encyclopedia.com/topic/.aspx#1E1-GreenwTm" title="Facts and information about Greenwich mean time">Greenwich mean time</a>

Give this article a thumbs-up on StumbleUpon

Cite this article
Pick a style below, and copy the text for your bibliography.

MLA
Chicago
APA

"Greenwich mean time." The Columbia Encyclopedia, Sixth Edition. 2008. Encyclopedia.com. 1 Dec. 2009 <http://www.encyclopedia.com>.

"Greenwich mean time." The Columbia Encyclopedia, Sixth Edition. 2008. Encyclopedia.com. (December 1, 2009). http://www.encyclopedia.com/doc/1E1-GreenwTm.html

"Greenwich mean time." The Columbia Encyclopedia, Sixth Edition. 2008. Retrieved December 01, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-GreenwTm.html

Learn more about citation styles

Greenwich Mean Time

The Oxford Essential Dictionary of the U.S. Military | 2001 | Â© The Oxford Essential Dictionary of the U.S. Military 2001, originally published by Oxford University Press 2001. (Hide copyright information) Copyright

Greenwich Mean Time former term for Universal Time.

Create a link to this page

Copy and paste this link tag into your Web page or blog:

<a href="http://www.encyclopedia.com/topic/.aspx#1O63-GreenwichMeanTime" title="Facts and information about Greenwich mean time">Greenwich mean time</a>

Cite this article
Pick a style below, and copy the text for your bibliography.

MLA
Chicago
APA

"Greenwich Mean Time." The Oxford Essential Dictionary of the U.S. Military. 2001. Encyclopedia.com. 1 Dec. 2009 <http://www.encyclopedia.com>.

"Greenwich Mean Time." The Oxford Essential Dictionary of the U.S. Military. 2001. Encyclopedia.com. (December 1, 2009). http://www.encyclopedia.com/doc/1O63-GreenwichMeanTime.html

"Greenwich Mean Time." The Oxford Essential Dictionary of the U.S. Military. 2001. Retrieved December 01, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O63-GreenwichMeanTime.html

Learn more about citation styles

Greenwich Mean Time

A Dictionary of Astronomy | 1997 | Â© A Dictionary of Astronomy 1997, originally published by Oxford University Press 1997. (Hide copyright information) Copyright

Greenwich Mean Time (GMT) The mean solar time on the Greenwich meridian, now more generally known astronomically as Universal Time (UT). It is the Greenwich hour angle of the mean sun + 12 hours, as the day starts at midnight.

Create a link to this page

Copy and paste this link tag into your Web page or blog:

<a href="http://www.encyclopedia.com/topic/.aspx#1O80-GreenwichMeanTime" title="Facts and information about Greenwich mean time">Greenwich mean time</a>

Cite this article
Pick a style below, and copy the text for your bibliography.

MLA
Chicago
APA

"Greenwich Mean Time." A Dictionary of Astronomy. 1997. Encyclopedia.com. 1 Dec. 2009 <http://www.encyclopedia.com>.

"Greenwich Mean Time." A Dictionary of Astronomy. 1997. Encyclopedia.com. (December 1, 2009). http://www.encyclopedia.com/doc/1O80-GreenwichMeanTime.html

"Greenwich Mean Time." A Dictionary of Astronomy. 1997. Retrieved December 01, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O80-GreenwichMeanTime.html

Learn more about citation styles

Related entries from encyclopedias, dictionaries and thesauruses

Rate these entries|See all related entries

Free newspaper and magazine articles

	Greenwich Mean Time Ships DataCop v4.1. Business Wire; 11/17/2000
	Year 2000 Wire/Greenwich Mean Time-UTA Takes Home 3 Out Of 7 Awards From Breakaway XChange Competition. Business Wire; 9/8/1998
	S&P:CORRECT:University of Greenwich Rated 'BBB'. Business Wire; 1/19/2000

Facts and information from other sites

Related articles from newspapers, magazines, and more

	Greenwich Mean Time? Depends what you mean by time Newspaper article from: Evening Standard - London; 1/6/1999; ; 700+ words ; ...the very home of time, the place from...the fact. But Greenwich, to its shame...gave its name to Mean Time, has either...clock anywhere in Greenwich. Indeed, a survey...slow. Taking a mean average between...Greenwich Mean Time. Things do not...fast. Neither do ...
	MUSIC; Greenwich time; The 'Pack' is back and Girl Group classics reign Supreme; Greenwich recalls glory days.(Scene) Newspaper article from: The Boston Herald; 4/13/2001; ; 700+ words ; ...life story was used as the means to tie the songs together...coming to the Shubert Theatre, Greenwich's life story has been eliminated...significant as the songs," Greenwich explains, "so he took that...Mary Wilson doing it." So Greenwich's durable songs will continue...about what these songs ...
	American Times: Greenwich, Connecticut: Greenwich means time Newspaper article from: The Independent - London; 12/30/1998; ; 700+ words ; ...will belong to that other Greenwich, the one across the pond...historically the world's time is measured. We will, in fact, pretend we are in the Greenwich of Wren and not in Connecticut. And why not? Greenwich, Connecticut, with its...
	Greenwich Mean Time enters Asia in new desktop management deal. M2 Presswire; 12/6/2000; 700+ words ; ...PRESSWIRE-6 December 2000-GREENWICH MEAN TIME: Greenwich Mean Time enters Asia in new...observed the way in which Greenwich Mean Time conducts their business, I am...collaboration today," Mitchell stated. Greenwich Mean Time, which has a ...
	Greenwich is a town keeping time with both history and the future Newspaper article from: The Milwaukee Journal Sentinel; 1/31/1999; ; 700+ words ; ...should you take the longer view, Greenwich is a cradle of civilization...19th centuries, the origin of Greenwich Mean Time and reference point for global...stand atop the highest rise in Greenwich Park and look north beyond the...
	Greenwich Mean Time announces breakthrough in anti-porn technology; Datacop set to police corporate networks. M2 Presswire; 10/11/2000; 700+ words ; M2 PRESSWIRE-11 October 2000-GREENWICH MEAN TIME: Greenwich Mean Time announces breakthrough in anti-porn...COMMUNICATIONS LTD RDATE:11102000 Fareham, Hampshire -- Greenwich Mean Time Software Ltd. today announced DataCop...
	Greenwich Mean Time ships DataCop v4.1; Corporate cyber surfers, bandwidth bandits, and porn perverts - your time is up! M2 Presswire; 11/14/2000; 700+ words ; M2 PRESSWIRE-14 November 2000-GREENWICH MEAN TIME: Greenwich Mean Time ships DataCop v4.1; Corporate cyber...COMMUNICATIONS LTD RDATE:14112000 Fareham, Hampshire -- Greenwich Mean Time today announced that it is shipping DataCop...
	Time is running out for the big night in Greenwich Less than a fortnight to go and the millennium's 'must' venue still has vacancies Newspaper article from: Evening Standard - London; 12/23/1999; 700+ words ; ...owners in the Home of Time, was predicting a New...everyone believed that Greenwich would host a number of...for 50,000 people in Greenwich Park with another sketched...revellers to be allowed into Greenwich town centre on the night...regular customers. "That means only 20 regulars who...
	Greenwich mean time Newspaper article from: The Independent - London; 5/19/1994; ; 700+ words ; ...atmosphere in the school at times tense. That tension spilled...more than two years ago. Greenwich Council, under pressure from...hope for survival. Before Greenwich ruled that it must close...It was the first school in Greenwich to do so. Two thirds of the...it's a complete waste of time ...
	A mean time in Greenwich Magazine article from: The Spectator; 9/22/2007; ; 700+ words ; ...Truman Capote 'just wanted to get out of Greenwich and get to New York'. The local high...line into Connecticut and pulled into Greenwich, the southernmost town of New England...people have their own drivers here. Greenwich is known primarily for one thing: wealth...