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GMT
Greenwich
Greenwich
Mean Time
Time
(GMT) is the mean solar time at the Royal Observatory in Greenwich, London. GMT was formerly used as the international civil time standard, now superseded in that function by Coordinated Universal Time
Coordinated Universal Time
(UTC). Today GMT is considered equivalent to UTC for UK civil purposes (but this is not formalised) and for navigation is considered equivalent to UT1 (the modern form of mean solar time at 0° longitude); these two meanings can differ by up to 0.9 s
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Shepherd Gate Clock
The Shepherd Gate Clock
Shepherd Gate Clock
is mounted on the wall outside the gate of the Royal Greenwich Observatory
Royal Greenwich Observatory
building in Greenwich, Greater London. The clock, an early example of an electric clock, was a slave mechanism controlled by electric pulses transmitted by a master clock inside the main building. The network of master and slave clocks was constructed and installed by Charles Shepherd in 1852. The clock by the gate was probably the first to display Greenwich
Greenwich
Mean Time to the public, and is unusual in using the 24-hour analog dial.Contents1 Origins 2 Charles Shepherd 3 Transmitting Greenwich
Greenwich
time 4 Since installation 5 See also 6 Notes 7 References 8 External linksOrigins[edit] The original idea for the clock network came from the Astronomer Royal, George Airy
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Orbit
In physics, an orbit is the gravitationally curved trajectory of an object,[1] such as the trajectory of a planet around a star or a natural satellite around a planet. Normally, orbit refers to a regularly repeating trajectory, although it may also refer to a non-repeating trajectory. To a close approximation, planets and satellites follow elliptic orbits, with the central mass being orbited at a focal point of the ellipse,[2] as described by Kepler's laws of planetary motion. Current understanding of the mechanics of orbital motion is based on Albert Einstein's general theory of relativity, which accounts for gravity as due to curvature of spacetime, with orbits following geodesics
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Greenwich Time (newspaper)
Greenwich Time is a daily newspaper based in Greenwich, Connecticut, United States. The paper shares an editor and publisher with The Advocate of nearby Stamford, Connecticut. Both papers are owned and operated by the Hearst Corporation. In 1977, Southern Connecticut Newspapers, which owned the Time and the Stamford Advocate, was acquired by Times Mirror.[2] Times Mirror was acquired by Tribune in 2000.[3] In March 2007, Tribune announced it would sell the two papers to Gannett
Gannett
for US$73 million, but the deal fell through when Gannett refused to honor 35 Advocate newsroom workers' union contract with Local 2110 of United Auto Workers.[4] The Time and its sister paper, The Advocate, were sold to Hearst for US$62.4 million by Tribune Company
Tribune Company
in a deal that closed November 1, 2007. The sale did not include Tribune-owned land in Stamford and Greenwich, including the papers' printing presses
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UTC+04
UTC+04:00 is an identifier for a time offset from UTC of +04. In ISO 8601 the associated time would be written as 2018-04-06T02:17:58+04:00
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Mauritius Time
Mauritius
Mauritius
Time, or MUT, is a time zone used by the Indian Ocean
Indian Ocean
island nation of Mauritius. The zone is four hours ahead of UTC (UTC+4). Daylight saving
Daylight saving
time was used in 2008. Clocks were put forward to UTC+5
UTC+5
on October 26, 2008 and put back to standard time on March 29, 2009 at 3 AM local daylight time.[1] The time change is no longer applied. References[edit]^ Mauritius
Mauritius
turns the clock forward in October 2008This Mauritius-related article is a stub. You can help by expanding it.v t eThis standards- or measurement-related article is a stub
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Seychelles Time
Seychelles
Seychelles
Time, or SCT, is a time zone used by the Seychelles. The zone is four hours ahead of UTC (UTC+4). Daylight saving
Daylight saving
time is not observed in this time zone.This Seychelles-related article is a stub. You can help by expanding it.v t eThis standards- or measurement-related article is a stub
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Cape Verde
Cape Verde
Cape Verde
(/ˌkeɪp ˈvɜːrd/) or Cabo Verde (/ˌkɑːboʊ ˈvɜːrdeɪ/, /ˌkæb-/) (Portuguese: Cabo Verde, pronounced [ˈkaβu ˈveɾðɨ]), officially the Republic
Republic
of Cabo Verde,[9] is an island country spanning an archipelago of 10 volcanic islands in the central Atlantic Ocean. It forms part of the Macaronesia
Macaronesia
Ecoregion, along with the Azores, Canary Islands, Madeira, and the Savage Isles. In ancient time these islands were referred to as "the Islands of the Blessed" or the "Fortunate Isles"
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Local Mean Time
Local mean time
Local mean time
is a form of solar time that corrects the variations of local apparent time, forming a uniform time scale at a specific longitude. This measurement of time was used for everyday use during the 19th century before time zones were introduced beginning in the late 19th century; it still has some uses in astronomy and navigation.[1] Past use[edit] Local mean time
Local mean time
was used from the early 19th century, when local solar time or sundial time was last used until standard time was adopted on various dates in the several countries. Each town or city kept its own meridian. This led to a situation where locations one degree of longitude apart had times four minutes apart.[2] This became a problem in the mid 19th century when railways needed clocks that were synchronized between stations, at the same time as people needed to match their clock (or the church clock) to the time tables
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Solar Time
Solar time
Solar time
is a calculation of the passage of time based on the position of the Sun
Sun
in the sky. The fundamental unit of solar time is the day. Two types of solar time are apparent solar time (sundial time) and mean solar time (clock time).Contents1 Introduction 2 Apparent solar time 3 Mean solar time 4 History 5 See also 6 References 7 External linksIntroduction A tall pole vertically fixed in the ground casts a shadow on any sunny day. At one moment during the day, the shadow will point exactly north or south (or disappear when and if the Sun
Sun
moves directly overhead). That instant is local apparent noon, or 12:00 local apparent time. About 24 hours later the shadow will again point north/south, the Sun seeming to have covered a 360-degree arc around the Earth's axis
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Axial Tilt
In astronomy, axial tilt, also known as obliquity, is the angle between an object's rotational axis and its orbital axis, or, equivalently, the angle between its equatorial plane and orbital plane.[1] It differs from orbital inclination. At an obliquity of zero, the two axes point in the same direction; i.e., the rotational axis is perpendicular to the orbital plane. Earth's obliquity oscillates between 22.1 and 24.5 degrees[2] on a 41,000-year cycle; the earth's mean obliquity is currently 23°26′12.9″ (or 23.43692°) and decreasing. Over the course of an orbit, the obliquity usually does not change considerably, and the orientation of the axis remains the same relative to the background stars
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Cape Verde Time
Cape Verde
Cape Verde
Time (CVT) is a time zone used by the Atlantic island nation of Cape Verde. The zone is one hour behind UTC (UTC-1). Daylight saving
Daylight saving
time is not observed in this time zone.This Cape Verdean location article is a stub. You can help by expanding it.v t eThis standards- or measurement-related article is a stub
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Sun
The Sun
Sun
is the star at the center of the Solar System. It is a nearly perfect sphere of hot plasma,[14][15] with internal convective motion that generates a magnetic field via a dynamo process.[16] It is by far the most important source of energy for life on Earth. Its diameter is about 1.39 million kilometers, i.e. 109 times that of Earth, and its mass is about 330,000 times that of Earth, accounting for about 99.86% of the total mass of the Solar System.[17] About three quarters of the Sun's mass consists of hydrogen (~73%); the rest is mostly helium (~25%), with much smaller quantities of heavier elements, including oxygen, carbon, neon, and iron.[18] The Sun
Sun
is a G-type main-sequence star
G-type main-sequence star
(G2V) based on its spectral class. As such, it is informally referred to as a yellow dwarf
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Greenwich Meridian
Coordinates: 51°28′40.12″N 0°00′05.31″W / 51.4778111°N 0.0014750°W / 51.4778111; -0.0014750Tourists taking pictures with the Prime Meridian monument Laser
Laser
projected from the Royal Observatory in Greenwich
Greenwich
marking the Prime meridian.A prime meridian, based at the Royal Observatory, Greenwich, in London, England,[1] was established by Sir George Airy in 1851. By 1884, over two-thirds of all ships and tonnage used it as the reference meridian on their charts and maps. In October of that year, at the behest of US President Chester A. Arthur, 41 delegates from 25 nations met in Washington, D.C., United States, for the International Meridian Conference
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Equation Of Time
The equation of time describes the discrepancy between two kinds of solar time. The word equation is used in the medieval sense of "reconcile a difference". The two times that differ are the apparent solar time, which directly tracks the diurnal motion of the Sun, and mean solar time, which tracks a theoretical mean Sun
Sun
with noons 24 hours apart. Apparent solar time
Apparent solar time
can be obtained by measurement of the current position (hour angle) of the Sun, as indicated (with limited accuracy) by a sundial. Mean
Mean
solar time, for the same place, would be the time indicated by a steady clock set so that over the year its differences from apparent solar time would resolve to zero.[1] The equation of time is the east or west component of the analemma, a curve representing the angular offset of the Sun
Sun
from its mean position on the celestial sphere as viewed from Earth
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Met Office
The Met Office
Met Office
(officially the Meteorological Office until 2000)[1] is the United Kingdom's national weather service. It is an executive agency and trading fund of the Department for Business, Energy and Industrial Strategy led by acting CEO[2], Nick Jobling and chief scientist, Professor Stephen Belcher
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