| International Atomic Time International Atomic Time (TAI, from the French name Temps Atomique International) is a high-precision atomic time standard that tracks proper time on Earth's geoid. It is the principal realisation of Terrestrial Time, and the basis for Coordinated Universal Time (UTC) which is used for civil timekeeping all over the Earth's surface. International_Atomic_Time
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| Asteroid Asteroids, sometimes called minor planets or planetoids, are bodies—primarily of the inner Solar System—that are smaller than planets but larger than meteoroids (commonly defined as being 10 meters across or less), with the exception of comets. The distinction between asteroids and comets is made on visual appearance when discovered: Comets show a perceptible coma (a fuzzy "atmosphere"), while asteroids do not. Asteroid
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| Astrometry Astrometry is the branch of astronomy that relates to precise measurements and explanations of the positions and movements of stars and other celestial bodies. Although once thought of as an esoteric field with little useful application for the future, the information obtained by astrometric measurements is now very important in contemporary research into the kinematics and physical origin of our Solar System and our Galaxy, the Milky Way. Astrometry
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| Algol Database entry for Algol A, SIMBAD. Accessed online February 9, 2008. Algol
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| Anti-ballistic missile An anti-ballistic missile (ABM) is a missile designed to counter ballistic missiles (a missile for missile defense). A ballistic missile is used to deliver nuclear, chemical, biological or conventional warheads in a ballistic flight trajectory. Anti-ballistic_missile
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| Alpha Centauri /B Alpha_Centauri
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| Aircraft carrier An aircraft carrier is a warship designed with a primary mission of deploying and recovering aircraft, acting as a seagoing airbase. Aircraft carriers thus allow a naval force to project air power great distances without having to depend on local bases for staging aircraft operations. Aircraft_carrier
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| Atomic clock An atomic clock is a type of clock that uses an atomic resonance frequency standard as its timekeeping element. They are the most accurate time and frequency standards known, and are used as primary standards for international time distribution services, and to control the frequency of television broadcasts and GPS satellite signals. Atomic_clock
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| AIM-54 Phoenix The AIM-54 Phoenix is a radar-guided, long-range air-to-air missile, carried in clusters of up to six missiles — formerly on the U.S. AIM-54_Phoenix
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| Battleship A battleship is a large, heavily armored warship with a main battery consisting of the largest calibre of guns. Battleships were larger, better armed, and better armored than cruisers and destroyers. Battleship
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| Blue Blue is a colour, the perception of which is evoked by light having a spectrum dominated by energy with a wavelength of roughly 440–490 nm. It is considered one of the additive primary colours. Blue
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| Bermuda Triangle The Bermuda Triangle, also known as the Devil's Triangle, is a region of the northwestern Atlantic Ocean in which a number of aircraft and surface vessels have disappeared or are alleged to have disappeared. Some people have claimed that these disappearances fall beyond the boundaries of human error or acts of nature. Bermuda_Triangle
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| Bézout's identity In number theory, Bézout's identity or Bézout's lemma is a linear diophantine equation. It states that if a and b are nonzero integers with greatest common divisor d, then there exist integers x and y (called Bézout numbers or Bézout coefficients) such that Bézout's_identity
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| Blue Angels The United States Navy's Navy Flight Demonstration Squadron, popularly known as the Blue Angels, was formed in 1946 and was the world's first officially sanctioned military aerial demonstration team. The squadron's six demonstration pilots fly the Boeing FA-18 Hornet in more than 70 shows at 34 locations throughout the United States each year, where they still employ many of the same practices and techniques used in their aerial displays in 1946. Blue_Angels
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| Bathyscaphe Trieste Trieste was a Swiss-designed deep-diving research bathyscaphe ("deep boat") with a crew of two people, which reached a record-breaking depth of about , in the deepest part of any ocean on earth, the Challenger Deep in the Mariana Trench, in 1960. The dive has never been repeated, and currently no crewed or uncrewed craft exists capable of reaching such depth. Bathyscaphe_Trieste
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| CSS Virginia CSS Virginia was an ironclad warship of the Confederate States Navy during the American Civil War (built using the remains of the scuttled USS Merrimack). CSS_Virginia
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| Crystal [Quartz crystal 66.JPG|thumb|Quartz] crystal. Crystal
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| Common Era Common Era (also known as Christian Era and Current Era; Common_Era
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| Congressional Medal of Honor Talk:Congressional_Medal_of_Honor
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| Cruise missile A cruise missile is a guided missile that carries an explosive payload and uses a lifting wing and a propulsion system, usually a jet engine, to allow sustained flight; it is essentially a flying bomb. Cruise missiles are generally designed to carry a large conventional or nuclear warhead many hundreds of miles with high accuracy. Cruise_missile
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| Cuban Missile Crisis The Cuban Missile Crisis was a confrontation between the United States, the Soviet Union, and Cuba during the Cold War. In Russia, it is termed the "Caribbean Crisis," (, Karibskiy krizis) while in Cuba it is called the "October Crisis. Cuban_Missile_Crisis
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| Cruiser A cruiser is a large type of warship, which had its prime period from the late 19th century to the end of the Cold War. The first cruisers were intended for individual raiding and protection missions on the seas. Cruiser
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| Cannon A cannon is a type of artillery, usually large and tubular, that uses gunpowder or other explosive-based propellants to launch a projectile over a distance. Cannon vary in caliber, range, mobility, rate of fire, angle of fire, and firepower; different forms of cannon combine and balance these attributes in varying degrees, depending on their intended use on the battlefield. Cannon
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| Color temperature Color temperature is a characteristic of visible light that has important applications in lighting, photography, videography, publishing, and other fields. The color temperature of a light source is determined by comparing its chromaticity with that of an ideal black-body radiator. Color_temperature
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| Cold fusion Cold fusion, sometimes called low energy nuclear reactions (LENR) or condensed matter nuclear science, is a set of effects reported in controversial laboratory experiments at ordinary temperatures and pressures; some researchers claim these effects are caused by nuclear reactions. Cold_fusion
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| Foreign policy of the United States The foreign policy of the United States is highly influential on the world stage, as it is a superpower. America's global reach is backed by a 13 trillion dollar economy. Foreign_policy_of_the_United_States
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| C-130 Hercules |unit cost = C-130_Hercules
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| Carrier battle group A carrier battle group (CVBG) consists of an aircraft carrier (CV) and its escorts. Carrier_battle_group
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| CH-46 Sea Knight The Boeing CH-46 Sea Knight is a medium-lift tandem rotor cargo helicopter, used by the United States Marine Corps (USMC) to provide all-weather, day-or-night assault transport of combat troops, supplies and equipment. Assault Support is its primary function, and the movement of supplies and equipment is secondary. CH-46_Sea_Knight
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| Chief of Naval Operations The Chief of Naval Operations (CNO) is the highest ranking officer in the United States Navy and is a member of the Joint Chiefs of Staff 10 USC 151. Joint Chiefs of Staff: composition; functions. Chief_of_Naval_Operations
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| Challenger Deep The Challenger Deep is the deepest surveyed point in the oceans, with a depth of about 11,000 metres (about 36,000 feet). The exact depth is unknown. Challenger_Deep
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| Crystallography Crystallography is the experimental science of determining the arrangement of atoms in solids. In older usage, it is the scientific study of crystals. Crystallography
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| Cavitation Cavitation is defined as the phenomenon of formation of vapour bubbles of a flowing liquid in a region where the pressure of the liquid falls below its vapour pressure. Cavitation is usually divided into two classes of behavior: inertial (or transient) cavitation and non-inertial cavitation. Cavitation
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| Day A day (symbol: d) is a unit of time equivalent to 24 hours and the duration of a single rotation of planet Earth around the sun. It is not an SI unit but it is accepted for use with SI. Day
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| Dartmouth College | president = James Edward Wright Dartmouth_College
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| Diego Garcia | r1-number = 13/31 Diego_Garcia
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| ΔT ΔT, Delta T, delta-T, deltaT, or DT is the time difference obtained by subtracting Universal Time from Terrestrial Time. ΔT
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| Earth | caption = Famous "Blue Marble" photograph of Earth, taken from Apollo 17 Earth
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| Ecliptic thumb|300px|The plane of the ecliptic is well seen in this picture from the [[1994 lunar prospecting Clementine spacecraft. Clementine's camera reveals (from right to left) the Moon lit by Earthshine, the Sun's glare rising over the Moon's dark [and the planets Saturn], [[Mars and Mercury (the three dots at lower left). Ecliptic
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| Easter Easter (Greek: Πάσχα, Pascha or Pasxa) is the most important religious feast in the Christian liturgical year.Anthony Aveni, "The Easter/Passover Season: Connecting Time's Broken Circle," The Book of the Year: A Brief History of Our Seasonal Holidays (Oxford: Oxford University Press, 2004), 64-78. Easter
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| Equinox An equinox is the event of the Sun passing over the Earth's equator, in its annual cycle. By extension it also signifies the time at which it happens and the apparent position of the Sun at that moment. Equinox
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| Euphonium The euphonium is a conical-bore, baritone-voiced brass instrument. It derives its name from the Greek word euphonos, meaning "beautiful-sounding" or "sweet-voiced" (eu means "well" or "good" and phonium means "voice"). Euphonium
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| Northrop F-5 The F-5A/B Freedom Fighter and F-5E/F Tiger II are part of a family of widely used light supersonic fighter aircraft, designed and built by Northrop in the United States, beginning in 1960s. Hundreds remain in service in air forces around the world in the early 21st Century, and the type has also been the basis for a number of other aircraft. Northrop_F-5
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| Field-effect transistor The field-effect transistor (FET) is a type of transistor that relies on an electric field to control the shape and hence the conductivity of a 'channel' of one type of charge carrier in a semiconductor material. FETs are sometimes called unipolar transistors to contrast their single-carrier-type operation with the dual-carrier-type operation of bipolar (junction) transistors (BJT). Field-effect_transistor
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| French Republican Calendar Talk:French_Republican_Calendar
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| Full moon Full moon is a lunar phase that occurs when the Moon is on the opposite side of the Earth from the Sun. More precisely, a full moon occurs when the geocentric apparent longitudes of the Sun and Moon differ by 180 degrees; the Moon is then in opposition with the Sun. Full_moon
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| Frigate Talk:Frigate
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| F-14 Tomcat The Grumman F-14 Tomcat is a supersonic, twin-engine, two-seat, variable geometry wing aircraft. The F-14 was the United States Navy's primary maritime air superiority fighter, fleet defense interceptor and tactical reconnaissance platform from 1974 to 2006. F-14_Tomcat
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| F4U Corsair |introduction= 28 December 1942 F4U_Corsair
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| Fast combat support ship The fast combat support ship (AOE) is the United States Navy's largest combat logistics ship, designed as an oiler, ammunition and supply ship. All fast combat support ships currently in service are operated by Military Sealift Command (MSC). Fast_combat_support_ship
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