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Topic: Greenwich Mean Time


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UTC
GMT

  
  Time Keeping in Astronomy
Note that LMT is not, in general, the same as the the civil time (standard time) at a location since the civil time is the same for all locations in that zone and is the LMT for the zone's standard longitude.
Sidereal time is time kept relative to the stars instead of relative to the sun.
Greenwich Sidereal Time (GST or ST0) is the local sidereal time on the Greenwich meridian.
www.astro.ufl.edu /~oliver/ast3722/lectures/CoordsNtime/time.htm   (1576 words)

  
  Greenwich Mean Time Encyclopedia Article @ AlienArtifacts.com (Alien Artifacts)   (Site not responding. Last check: )
Greenwich Mean Time (GMT) is mean solar time at the Royal Greenwich Observatory in Greenwich, London, England, the United Kingdom, which by convention is at 0 degrees geographic longitude.
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.
GMT was adopted on the Isle of Man in 1883, Jersey in 1898 and Guernsey in 1913.
www.alienartifacts.com /encyclopedia/Greenwich_Mean_Time   (559 words)

  
 Greenwich Mean Time
Greenwich Mean Time (GMT) is the mean solar time at the Royal Greenwich Observatory in Greenwich near London, England, which by convention is at 0 degrees geographic longitude.
Theoretically, noon Greenwich Mean Time is the moment when the Sun crosses the Greenwich meridian (and reaches its highest point in the sky in Greenwich).
Nowadays, the official clock time is measured by atomic clocks and is known as Coordinated Universal Time (UTC).
www.ebroadcast.com.au /lookup/encyclopedia/gm/GMT.html   (162 words)

  
 Local mean time - Wikipedia, the free encyclopedia
Local mean time is a form of solar time that corrects the variations of local apparent time.
Local mean time was used from the early nineteenth century, when local solar time or sundial time was last used, until standard time was adopted on various dates in the several countries.
Standard time means that the same time is used throughout some region — usually, it was either offset from Greenwich Mean Time or was the local mean time of the capital of the region.
en.wikipedia.org /wiki/Local_mean_time   (142 words)

  
 Internationalization Encyclopedia: : Greenwich mean time
It corresponds approximatelly to the mean solar time in that observatory.
In Autum 1884 it was adopted as the Universal Time (UT).
GMT is still widelly used today and is often refered to as UT1.
www.i18ngurus.com /encyclopedia/greenwich_mean_time.html   (117 words)

  
 Greenwich Mean Time - Britannica Concise
Greenwich Mean Time - (GMT), the former name for mean solar time of the longitude (0°) of the former Royal Observatory at Greenwich, Eng.
Universal Time - the mean solar time of the Greenwich meridian (0° longitude).
time - Until 1928 the standard time of the zero meridian was called Greenwich Mean Time (GMT), and in accord with astronomical tradition the epoch 0000 GMT occurred at noon.
concise.britannica.com /ebc/article-9366118   (576 words)

  
 Astronomical Times
By convention, the reference points for Greenwich Sidereal Time are the Greenwich Meridian and the vernal equinox (the intersection of the planes of the earth's equator and the earth's orbit, the ecliptic).
Greenwich Mean Sidereal Time (GMST) is the hour angle of the average position of the vernal equinox, neglecting short term motions of the equinox due to nutation.
Greenwich Apparent Sidereal Time (GAST) is Greenwich Mean Sidereal Time (GMST) corrected for the shift in the position of the vernal equinox due to nutation.
www.cv.nrao.edu /~rfisher/Ephemerides/times.html   (2060 words)

  
 Greenwich mean time – FREE Greenwich mean time Information | Encyclopedia.com: Facts, Pictures, Information!
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.
It's about time for a change to our clocks After the changing of the clocks at the weekend, a debate has continued to rage about whether we should stick with Greenwich Mean Time and British Summer Time or be one hour ahead of current arrangements all year round.
www.encyclopedia.com /doc/1E1-GreenwTm.html   (1016 words)

  
 GMT - Greenwich Mean Time - Zulu Time - World Time Clock
GMT is sometimes called Greenwich Meridian Time because it is measured from the Greenwich Meridian Line at the Royal Observatory in Greenwich.
GMT is World Time and the basis of every world time zone which sets the time of day and is at the centre of the time zone map.
Greenwich Mean Time is international time, the basis of the world time clock.
www.mthurricane.com /Greenwich_Meridian_Time_zulu.htm   (174 words)

  
 SBlog: Mean time
GMT is sometimes called Greenwich Meridian Time because it is measured from the Greenwich Meridian Line at the Royal Observatory in Greenwich, the line and place from which all time zones are measured.
GMT marks the starting point of every time zone because it is situated on the Prime Meridian or Longitude Zero degrees.
GMT is the mean (average) time that the earth takes to rotate from noon to next noon, and thus sets current or official time around the globe.
sundeepsblog.blogspot.com /2005/05/mean-time.html   (258 words)

  
 SMHS Weather Station: Greenwich Mean Time Explained
Time is measured relative to Greenwich Mean Time (GMT).
The Greenwich Meridian, or Prime Meridian as it is normally called, was arbitrarily given the zero longitude.
The Mean Solar Day, based on a 24 hour clock, divides the Earth into different longitudes, which roughly define 25 different time zones throughout the world.
www.saskschools.ca /~ghuczek/greenwichmeantime.htm   (197 words)

  
 Greenwich Time Balls
Greenwich Mean Time, or GMT, is the internationally agreed reference point for determining the time.
GMT is the time at zero degrees longitude (the Prime Meridian) which passes through Greenwich, London.
The Old Royal Observatory is home of the Prime Meridian of the world and Greenwich Mean Time, and is part of the National Maritime Museum in Greenwich.
www.tumblong.uts.edu.au /artefacts/greenwich/index.cfm   (173 words)

  
 GMT Explained   (Site not responding. Last check: )
Greenwich Mean Time (GMT) became a time standard in the 19th century for British maritime navigation.
Greenwich, England was established as the "Prime Meridian" (longitude = 0 degrees) and the
Based on GMT, but to be a worldwide standard, the ITU felt it was best to designate a single abbreviation for use in all languages.
liftoff.msfc.nasa.gov /Academy/Rocket_Sci/clocks/time-gmt.html   (277 words)

  
 Greenwich Mean Time - Wikipedia, the free encyclopedia   (Site not responding. Last check: )
On January 1, 1972, GMT was replaced as the international time reference by Coordinated Universal Time (UTC), maintained by an ensemble of atomic clocks around the world.
Although civil time, e.g., the Greenwich Time Signal in the United Kingdom, is now based on UTC, it is still popularly (though erroneously) called GMT.
Those countries marked in dark blue on the map at right use European Summer Time and advance their clock one hour in the summer.
www.plano.us /project/wikipedia/index.php/Greenwich_mean_time   (484 words)

  
 Greenwich Mean Time - Hutchinson encyclopedia article about Greenwich Mean Time   (Site not responding. Last check: )
By international convention, the meridian line at Greenwich, which runs through the Royal Observatory telescope, marks 0° longitude and is the point from which all other lines of longitude are measured.
It was replaced in 1986 by coordinated universal time (UTC), but continued to be used to measure longitudes and the world's standard time zones.
Greenwich Mean Astronomical Time (12 Hours behind Universal Time)
encyclopedia.farlex.com /Greenwich+Mean+Time   (186 words)

  
 Greenwich Mean Time
Greenwich Observatory was well respected for it's accurate timekeeping and was charged with establishing a standard time for the UK - they developed Greenwich Mean Time.
GMT became the accepted time across the UK and the first trains began to run to a timetable (although Virgin clearly still favours local time - check the sun for departure times).
This meant that an average or Mean Time was necessary and is based on noon at Greenwich.
www.tiscali.co.uk /lifestyle/features/greenwich_mean_time.html   (488 words)

  
 GMT Explained
Greenwich Mean Time (GMT) became a time standard in the 19th century for British maritime navigation.
Greenwich, England was established as the "Prime Meridian" (longitude = 0 degrees) and the
Based on GMT, but to be a worldwide standard, the ITU felt it was best to designate a single abbreviation for use in all languages.
science.nasa.gov /Realtime/Rocket_Sci/clocks/time-gmt.html   (277 words)

  
 Time, Greenwich Mean Time (GMT), Time Zones, Zulu Time, Calendars, 2012, History behind Time Zones, Mayan calendar, ...
Greenwich Mean Time (GMT) is a term that originally referred to the time at the Royal Observatory, Greenwich, England.
Greenwich Mean Time (GMT) was established in 1675, when the Royal Observatory was built, as an aid to determine longitude by mariners at sea.
A modern version of a time ball is the ball drop at the stroke of midnight on December 31, notably in Times Square, New York City and the Peach Drop in Atlanta, Georgia.
www.lat34north.com /Cities/CitiesTime.cfm   (3901 words)

  
 FAI Astronautic Records Commission - About the Time
However with this local system each city has its own time and with the development of railways the confusion became so great that many countries decided to adopt as civil time the mean solar time of their capital.
The mean solar time of the Greenwich observatory, near London (UK), became the civil time of all Britain in the 1880's under the name of G C T, Greenwich civil time, later called G M T, Greenwich mean time.
In 1955 the unit of time, the second, became defined by the motions of planets ("second of ephemeris") but this difficult and inconvenient definition was forsaken in 1967 for the accurate and convenient second defined by the atomic frequency standards.
www.fai.org /astronautics/time.asp   (1151 words)

  
 World Time Zones - Guides
GMT is the mean solar time at the prime meridian (the line of longitude where east meets west), which runs through Greenwich in the UK.
GMT is measured from midnight, so the new day begins at 0000 GMT and the time six hours later would be expressed as 0600 GMT.
GMT is not quite in line with this atomic time, because the scientific definition of a single second has changed.
www.worldtimezones.com /guides/greenwich_mean_time   (861 words)

  
 Greenwich Mean Time (GMT)
The name of the twenty-four hour time scale that is used throughout the scientific and military communities.
The globe is divided into twenty-four (24) time zones of 15 degrees of arc, or one hour in time apart.
To the east of this meridian, time zones are numbered 1 to 12 and prefixed with a minus (-), while to the west, the time zones are also numbered 1 through 12 but prefixed with a plus (+).
www.fema-law.com /glossary/term.asp?id=98   (102 words)

  
 Astrology: Calculating the Chart - Greenwich Mean Time GMT
She was born very close to the time zone of 75 degrees, but she was born 20 arc minutes to the west of this zonem (75W20), so her sun rose a little later than shown for the time zone.
The local mean time is similar to the UT, except that the local mean time is computed from the exact longitude of birth and not the time zone.
The UT is used to calculate the position of the planets and the local time is used to calculate the ascendant and the cusps of the houses.
www.trans4mind.com /personal_development/astrology/Calculations/calcGMT.htm   (1837 words)

  
 Greenwich Grid
Greenwich England is where East meets West at the Greenwich Meridian (0° Longitude); Greenwich is where World Time is set Greenwich Mean Time (GMT).
The Royal Observatory at Greenwich is in Greenwich Park along with the National Maritime Museum and the Queens House (on which the White House in Washington DC, USA is based).
Greenwich has a long heritage; it was the birth place of King Henry VIII and his daughters Queen Mary (Bloody Mary) and Queen Elizabeth I (The Virgin Queen).
wwp.greenwichmeantime.co.uk /greenwich-grid/index.htm   (345 words)

  
 [No title]
Greenwich Mean Time ------------------- o Greenwich Mean Time is a time scale based on the apparent motion of the "mean" sun with respect to the meridian through the Old Greenwich Observatory (zero degrees longitude).
The "mean" sun is used because time based on the actual or true apparent motion of the sun doesn't "tick" at a constant rate.
Some in the astronomical community still use the pre-1925 definition of GMT in the analysis of old data although it is recommended that the term Greenwich Mean Astronomical Time now be used to refer to time reckoned from noon.) o Mean time on selected meridians 15 degrees apart is generally known as standard time.
gauss.gge.unb.ca /GMT.UT.and.the.RGO.txt   (1767 words)

  
 A Few Facts Concerning GMT, UT, and the RGO
Greenwich Mean Time ------------------- o Greenwich Mean Time is a time scale based on the apparent motion of the "mean" sun with respect to the meridian through the Old Greenwich Observatory (zero degrees longitude).
The "mean" sun is used because time based on the actual or true apparent motion of the sun doesn't "tick" at a constant rate.
Some in the astronomical community still use the pre-1925 definition of GMT in the analysis of old data although it is recommended that the term Greenwich Mean Astronomical Time now be used to refer to time reckoned from noon.) o Mean time on selected meridians 15 degrees apart is generally known as standard time.
www.apparent-wind.com /gmt-explained.html   (1770 words)

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