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GMT 12
Greenwich Mean Time (GMT) is the local mean time at the Royal Observatory in Greenwich, London, counted from midnight. At different times in the past, it has been calculated in different ways, including being calculated from noon; as a consequence, it cannot be used to specify a particular time unless a context is given. The term "GMT" is also used as one of the names for the time zone UTC+00:00 and, in UK law, is the basis for civil time in the United Kingdom. Because of Earth's uneven angular velocity in its elliptical orbit and its axial tilt, noon (12:00:00) GMT is rarely the exact moment the Sun crosses the Greenwich Meridian and reaches its highest point in the sky there. This event may occur up to 16 minutes before or after noon GMT, a discrepancy described by the equation of time. Noon GMT is the annual average (the arithmetic mean) moment of this event, which accounts for the word "mean" in "Greenwich Mean Time". Originally, astronomers considered a GMT day to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Local Mean Time
Local mean time (LMT) 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. The difference between local mean time and local apparent time is the equation of time. Past use 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, so locations one degree of longitude apart had times four minutes apart. This became a problem in the mid 19th century when railways needed clocks for railway time that were synchronized between stations, while local people needed to match their clock (or the church clock) to the time tables. Standard time means that t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Equation Of Time
The equation of time describes the discrepancy between two kinds of solar time. 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 with uniform motion along the celestial equator. Apparent solar time can be obtained by measurement of the current position (Hour angle#Solar hour angle, hour angle) of the Sun, as indicated (with limited accuracy) by a sundial. ''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 have a mean of zero. The equation of time is the east or west component of the analemma, a curve representing the angular offset of the Sun from its mean position on the celestial sphere as viewed from Earth. The equation of time values for each day of the year, compiled by astronomical observatory, observatories, were widely listed in almanacs and ephemeri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maritime Nation
A maritime nation is any nation that borders the sea and is dependent on its use for the majority of the following state activities: commerce and transport, war, to define a territorial boundary, or for any maritime activity (activities using the sea to convey or produce an end result). Historically, the term has been used to refer to a thalassocracy such as Carthage Carthage was an ancient city in Northern Africa, on the eastern side of the Lake of Tunis in what is now Tunisia. Carthage was one of the most important trading hubs of the Ancient Mediterranean and one of the most affluent cities of the classic ... and Phoenicia but during the medieval period increasingly became associated with the Maritime Republics of Republic of Venice, Venice, Republic of Pisa, Pisa, Republic of Genoa, Genoa, Duchy of Amalfi, Amalfi, Duchy of Gaeta, Gaeta, Republic of Ancona, Ancona and Republic of Ragusa, Ragusa.G. Benvenuti - Le Repubbliche Marinare. Amalfi, Pisa, Genova, Manusia Kontlo Vene ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Greenwich Clock
Greenwich ( , , ) is an area in south-east London, England, within the ceremonial county of Greater London, east-south-east of Charing Cross. Greenwich is notable for its maritime history and for giving its name to the Greenwich Meridian (0° longitude) and Greenwich Mean Time. The town became the site of a royal palace, the Palace of Placentia, from the 15th century and was the birthplace of many Tudors, including Henry VIII and Elizabeth I. The palace fell into disrepair during the English Civil War and was demolished, eventually being replaced by the Royal Naval Hospital for Sailors, designed by Sir Christopher Wren and his assistant Nicholas Hawksmoor. These buildings became the Royal Naval College in 1873, and they remained a military education establishment until 1998, when they passed into the hands of the Greenwich Foundation. The historic rooms within these buildings remain open to the public; other buildings are used by the University of Greenwich and Trinity La ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Middle East Broadcasting Centre
MBC Group (), formerly known as Middle East Broadcasting Center (), is a Saudi media conglomerate based in the Riyadh region. Launched in London in 1991, the company moved its headquarters to Dubai in 2002 and to Riyadh in 2022. It is majority owned by the Saudi government-operated Public Investment Fund. MBC Group operates over 19 free-to-air satellite TV channels, and a video-on-demand service (Shahid). MBC 1 was the first broadcaster to provide a satellite-based, free-to-air 24-hour television broadcasting network across the Arab world. The Group's current chairman is Sam Barnett. Barnett returned as MBC Group CEO in December 2020 after a one-year departure. MBC's television arm broadcasts via Eutelsat, Arabsat and Nilesat satellites. MBC has more than 2,000 staff. In recent years MBC has been hit with major rounds of financial cuts, leading to 150 layoffs and major production cuts. These cuts were driven in part due to advertising not covering production costs and the fa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
