135 relations: Age of the universe, Air gun, Angle, Apparent place, Aristarchus of Samos, Asteroid, Astrometry, Astronomer Royal, Astronomical Almanac, Astronomical unit, Astronomy, Binocular disparity, Binoculars, Black drop effect, Celestial sphere, Coincidence rangefinder, Collimated light, Columbidae, Computer stereo vision, Computer vision, Copernican heliocentrism, Cosmic distance ladder, Depth perception, Distance, Doppler effect, Earth, Edmond Halley, Ender's Game, Ender's Shadow, Epistemology, Error, Euclid, European Space Agency, External ballistics, Field artillery, Fire-control system, Friedrich Bessel, From the Earth to the Moon, Gaia (spacecraft), Geometry, Georg Wilhelm Friedrich Hegel, Gunshot, Harold Spencer Jones, Heliocentrism, Heliometer, Hipparchus, Hipparcos, Hubble Space Telescope, Human eye, Hyades (star cluster), ..., Image stitching, Jacques Lacan, James Joyce, Jules Verne, Kojin Karatani, Light-year, Lunar phase, Lunar theory, Lutz–Kelker bias, Measurement, Microscope, Milky Way, Minute and second of arc, Mirror, MIT Press, Moon, Multimeter, Multiplicative inverse, Muzzleloader, NASA, Naval artillery, Nicolaus Copernicus, On the Sizes and Distances (Aristarchus), Ontology, Optical axis, Orbit of the Moon, Orson Scott Card, Oscilloscope, Parallax mapping, Parallax scrolling, Parameterized post-Newtonian formalism, Parsec, Perspective (graphical), Photogrammetry, Proper motion, Proxima Centauri, Ptolemy, Radar, Radian, Rangefinder camera, RealPlayer, Red dot sight, Reflector sight, Refraction, Reticle, Right triangle, Rimfire ammunition, Saturn, Shotgun, Sight (device), Sightline, Single-lens reflex camera, Slavoj Žižek, Small-angle approximation, Solar System, Spacecraft, Spectroscopic parallax, Speed of light, Spherical aberration, Star, Stereopsis, Subtended angle, Taurus (constellation), Telemetry, Telescope, Telescopic sight, Terrestrial planet, The Parallax View (book), Theodolite, Transit of Venus, Triangulation, Trigonometry, Trilateration, Twin-lens reflex camera, Tycho Brahe, Ulysses (novel), Viewfinder, Visual perception, Wiggle stereoscopy, Windage, Xallarap, Year, 1566 Icarus, 433 Eros, 61 Cygni. Expand index (85 more) » « Shrink index
In physical cosmology, the age of the universe is the time elapsed since the Big Bang.
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An air gun (or airgun) is any kind of gun that launches projectiles pneumatically with compressed air or other gases that are pressurized mechanically without involving any chemical reactions, in contrast to a firearm, which relies on an exothermic chemical oxidation (deflagration) of combustible propellants to generate propulsive energy.
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In plane geometry, an angle is the figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the angle.
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The apparent place of an object is its position in space as seen by an observer.
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Aristarchus of Samos (Ἀρίσταρχος ὁ Σάμιος, Aristarkhos ho Samios; c. 310 – c. 230 BC) was an ancient Greek astronomer and mathematician who presented the first known model that placed the Sun at the center of the known universe with the Earth revolving around it (see Solar system).
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Asteroids are minor planets, especially those of the inner Solar System.
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Astrometry is the branch of astronomy that involves precise measurements of the positions and movements of stars and other celestial bodies.
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Astronomer Royal is a senior post in the Royal Households of the United Kingdom.
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The Astronomical AlmanacThe Astronomical Almanac for the Year 2015, (United States Naval Observatory/Nautical Almanac Office, 2014).
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The astronomical unit (symbol: au, ua, or AU) is a unit of length, roughly the distance from Earth to the Sun.
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Astronomy (from ἀστρονομία) is a natural science that studies celestial objects and phenomena.
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Binocular disparity refers to the difference in image location of an object seen by the left and right eyes, resulting from the eyes’ horizontal separation (parallax).
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Binoculars or field glasses are two telescopes mounted side-by-side and aligned to point in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects.
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The black drop effect is an optical phenomenon visible during a transit of Venus and, to a lesser extent, a transit of Mercury.
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In astronomy and navigation, the celestial sphere is an abstract sphere with an arbitrarily large radius concentric to Earth.
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A coincidence rangefinder (stereoscopic, parallax, or split-image rangefinder) is a type of rangefinder that uses mechanical and optical principles to allow an operator to determine the distance to a visible object.
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Collimated light is light whose rays are parallel, and therefore will spread minimally as it propagates.
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Pigeons and doves constitute the animal family Columbidae and the order Columbiformes, which includes about 42 genera and 310 species.
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Computer stereo vision is the extraction of 3D information from digital images, such as those obtained by a CCD camera.
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Computer vision is a field that deals with how computers can be made for gaining high-level understanding from digital images or videos.
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Copernican heliocentrism is the name given to the astronomical model developed by Nicolaus Copernicus and published in 1543.
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects.
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Depth perception is the visual ability to perceive the world in three dimensions (3D) and the distance of an object.
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Distance is a numerical measurement of how far apart objects are.
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The Doppler effect (or the Doppler shift) is the change in frequency or wavelength of a wave in relation to observer who is moving relative to the wave source.
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Earth is the third planet from the Sun and the only astronomical object known to harbor life.
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Edmond (or Edmund) Halley, FRS (–) was an English astronomer, geophysicist, mathematician, meteorologist, and physicist.
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Ender's Game is a 1985 military science fiction novel by American author Orson Scott Card.
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Ender's Shadow (1999) is a parallel science fiction novel by the American author Orson Scott Card, taking place at the same time as the novel Ender's Game and depicting some of the same events from the point of view of Bean, a supporting character in the original novel.
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Epistemology is the branch of philosophy concerned with the theory of knowledge.
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An error (from the Latin error, meaning "wandering") is an action which is inaccurate or incorrect.
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Euclid (Εὐκλείδης Eukleidēs; fl. 300 BC), sometimes given the name Euclid of Alexandria to distinguish him from Euclides of Megara, was a Greek mathematician, often referred to as the "founder of geometry" or the "father of geometry".
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The European Space Agency (ESA; Agence spatiale européenne, ASE; Europäische Weltraumorganisation) is an intergovernmental organisation of 22 member states dedicated to the exploration of space.
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External ballistics or exterior ballistics is the part of ballistics that deals with the behavior of a projectile in flight.
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Field artillery is a category of mobile artillery used to support armies in the field.
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A fire-control system is a number of components working together, usually a gun data computer, a director, and radar, which is designed to assist a weapon system in hitting its target.
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Friedrich Wilhelm Bessel (22 July 1784 – 17 March 1846) was a German astronomer, mathematician, physicist and geodesist.
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From the Earth to the Moon (De la terre à la lune) is an 1865 novel by Jules Verne.
Gaia is a space observatory of the European Space Agency (ESA) designed for astrometry: measuring the positions and distances of stars with unprecedented precision.
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Geometry (from the γεωμετρία; geo- "earth", -metron "measurement") is a branch of mathematics concerned with questions of shape, size, relative position of figures, and the properties of space.
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Georg Wilhelm Friedrich Hegel (August 27, 1770 – November 14, 1831) was a German philosopher and the most important figure of German idealism.
A gunshot is a single discharge of a gun, typically a man-portable firearm, producing a visible flash, a powerful and loud shockwave and often chemical gunshot residue.
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Sir Harold Spencer Jones KBE FRS FRSE PRAS (29 March 1890 Kensington, London – 3 November 1960) was an English astronomer.
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Heliocentrism is the astronomical model in which the Earth and planets revolve around the Sun at the center of the Solar System.
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A heliometer (from Greek ἥλιος hḗlios "sun" and measure) is an instrument originally designed for measuring the variation of the sun's diameter at different seasons of the year, but applied now to the modern form of the instrument which is capable of much wider use.
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Hipparchus of Nicaea (Ἵππαρχος, Hipparkhos) was a Greek astronomer, geographer, and mathematician.
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Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993.
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The Hubble Space Telescope (HST) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation.
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The human eye is an organ which reacts to light and pressure.
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The Hyades (Greek Ὑάδες, also known as Melotte 25 or Collinder 50) is the nearest open cluster and one of the best-studied star clusters.
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Image stitching or photo stitching is the process of combining multiple photographic images with overlapping fields of view to produce a segmented panorama or high-resolution image.
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Jacques Marie Émile Lacan (13 April 1901 – 9 September 1981) was a French psychoanalyst and psychiatrist who has been called "the most controversial psycho-analyst since Freud".
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James Augustine Aloysius Joyce (2 February 1882 – 13 January 1941) was an Irish novelist, short story writer, and poet.
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Jules Gabriel Verne (Longman Pronunciation Dictionary.; 8 February 1828 – 24 March 1905) was a French novelist, poet, and playwright.
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is a Japanese philosopher and literary critic.
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The light-year is a unit of length used to express astronomical distances and measures about 9.5 trillion kilometres or 5.9 trillion miles.
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The lunar phase or phase of the Moon is the shape of the directly sunlit portion of the Moon as viewed from Earth.
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Lunar theory attempts to account for the motions of the Moon.
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The Lutz–Kelker bias is a supposed systematic bias that results from the assumption that the number of observable stars increases with the square of the distance.
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Measurement is the assignment of a number to a characteristic of an object or event, which can be compared with other objects or events.
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A microscope (from the μικρός, mikrós, "small" and σκοπεῖν, skopeîn, "to look" or "see") is an instrument used to see objects that are too small to be seen by the naked eye.
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The Milky Way is the galaxy that contains our Solar System.
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A minute of arc, arcminute (arcmin), arc minute, or minute arc is a unit of angular measurement equal to of one degree.
A mirror is an object that reflects light in such a way that, for incident light in some range of wavelengths, the reflected light preserves many or most of the detailed physical characteristics of the original light, called specular reflection.
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The MIT Press is a university press affiliated with the Massachusetts Institute of Technology (MIT) in Cambridge, Massachusetts (United States).
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The Moon is an astronomical body that orbits planet Earth and is Earth's only permanent natural satellite.
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A multimeter or a multitester, also known as a VOM (volt-ohm-milliammeter), is an electronic measuring instrument that combines several measurement functions in one unit.
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In mathematics, a multiplicative inverse or reciprocal for a number x, denoted by 1/x or x−1, is a number which when multiplied by x yields the multiplicative identity, 1.
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A muzzleloader is any firearm into which the projectile and usually the propellant charge is loaded from the muzzle of the gun (i.e., from the forward, open end of the gun's barrel).
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The National Aeronautics and Space Administration (NASA) is an independent agency of the executive branch of the United States federal government responsible for the civilian space program, as well as aeronautics and aerospace research.
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Naval artillery is artillery mounted on a warship, originally used only for naval warfare, later also for naval gunfire support against targets on land, and for anti-aircraft use.
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Nicolaus Copernicus (Mikołaj Kopernik; Nikolaus Kopernikus; Niklas Koppernigk; 19 February 1473 – 24 May 1543) was a Renaissance-era mathematician and astronomer who formulated a model of the universe that placed the Sun rather than the Earth at the center of the universe, likely independently of Aristarchus of Samos, who had formulated such a model some eighteen centuries earlier.
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On the Sizes and Distances (of the Sun and Moon) (Περὶ μεγεθῶν καὶ ἀποστημάτων, Peri megethon kai apostematon) is widely accepted as the only extant work written by Aristarchus of Samos, an ancient Greek astronomer who lived circa 310–230 BCE.
Ontology (introduced in 1606) is the philosophical study of the nature of being, becoming, existence, or reality, as well as the basic categories of being and their relations.
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An optical axis is a line along which there is some degree of rotational symmetry in an optical system such as a camera lens or microscope.
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The Moon orbits Earth in the prograde direction and completes one revolution relative to the stars in about 27.322 days (a sidereal month) and one revolution relative to the Sun in about 29.530 days (a synodic month).
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Orson Scott Card (born August 24, 1951) is an American novelist, critic, public speaker, essayist, and columnist.
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An oscilloscope, previously called an oscillograph, and informally known as a scope or o-scope, CRO (for cathode-ray oscilloscope), or DSO (for the more modern digital storage oscilloscope), is a type of electronic test instrument that allows observation of varying signal voltages, usually as a two-dimensional plot of one or more signals as a function of time.
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Parallax mapping (also called offset mapping or virtual displacement mapping) is an enhancement of the bump mapping or normal mapping techniques applied to textures in 3D rendering applications such as video games.
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Parallax scrolling is a technique in computer graphics where background images move past the camera more slowly than foreground images, creating an illusion of depth in a 2D scene and adding to the sense of immersion in the virtual experience.
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Post-Newtonian formalism is a calculational tool that expresses Einstein's (nonlinear) equations of gravity in terms of the lowest-order deviations from Newton's law of universal gravitation.
The parsec (symbol: pc) is a unit of length used to measure large distances to astronomical objects outside the Solar System.
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Perspective (from perspicere "to see through") in the graphic arts is an approximate representation, generally on a flat surface (such as paper), of an image as it is seen by the eye.
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Photogrammetry is the science of making measurements from photographs, especially for recovering the exact positions of surface points.
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Proper motion is the astronomical measure of the observed changes in the apparent places of stars or other celestial objects in the sky, as seen from the center of mass of the Solar System, compared to the abstract background of the more distant stars.
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Proxima Centauri, or Alpha Centauri C, is a red dwarf, a small low-mass star, about from the Sun in the constellation of Centaurus.
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Claudius Ptolemy (Κλαύδιος Πτολεμαῖος, Klaúdios Ptolemaîos; Claudius Ptolemaeus) was a Greco-Roman mathematician, astronomer, geographer, astrologer, and poet of a single epigram in the Greek Anthology.
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Radar is an object-detection system that uses radio waves to determine the range, angle, or velocity of objects.
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The radian (SI symbol rad) is the SI unit for measuring angles, and is the standard unit of angular measure used in many areas of mathematics.
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A rangefinder camera is a camera fitted with a rangefinder, typically a split-image rangefinder: a range-finding focusing mechanism allowing the photographer to measure the subject distance and take photographs that are in sharp focus.
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RealPlayer, formerly RealAudio Player, RealOne Player and RealPlayer G2, is a cross-platform media player app, developed by RealNetworks.
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A red dot sight is a common classification for a type of non-magnifying reflector (or reflex) sight for firearms, and other devices that require aiming, that gives the user an aimpoint in the form of an illuminated red dot.
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A reflector sight or reflex sight is an optical device that allows the user to look through a partially reflecting glass element and see an illuminated projection of an aiming point or some other image superimposed on the field of view.
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Refraction is the change in direction of wave propagation due to a change in its transmission medium.
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A reticle, or reticule, also known as a graticule, is a pattern of fine lines or markings built into the eyepiece of a sighting device, such as a telescopic sight in a telescope, a microscope, or the screen of an oscilloscope, to provide references during visual examination.
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A right triangle (American English) or right-angled triangle (British English) is a triangle in which one angle is a right angle (that is, a 90-degree angle).
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Rimfire is a method of ignition for metallic firearm cartridges as well as the cartridges themselves.
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Saturn is the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter.
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A shotgun (also known as a scattergun, or historically as a fowling piece) is a firearm that is usually designed to be fired from the shoulder, which uses the energy of a fixed shell to fire a number of small spherical pellets called shot, or a solid projectile called a slug.
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A sight is an aiming device used to assist in visually aligning ranged weapons, surveying instruments or optical illumination equipments with the intended target.
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A sightline (also sight line) or visual axis is a normally unobstructed line of sight between an intended observer (or spectator) and a subject of interest, such as a stage, arena, or monument.
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A single-lens reflex camera (SLR) is a camera that typically uses a mirror and prism system (hence "reflex" from the mirror's reflection) that permits the photographer to view through the lens and see exactly what will be captured.
Slavoj Žižek (born 21 March 1949) is a Slovenian continental philosopher.
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The small-angle approximation is a useful simplification of the basic trigonometric functions which is approximately true in the limit where the angle approaches zero.
The Solar SystemCapitalization of the name varies.
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A spacecraft is a vehicle or machine designed to fly in outer space.
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Spectroscopic parallax is an astronomical method for measuring the distances to stars.
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The speed of light in vacuum, commonly denoted, is a universal physical constant important in many areas of physics.
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Spherical aberration is an optical effect observed in an optical device (lens, mirror, etc.) that occurs due to the increased refraction of light rays when they strike a lens or a reflection of light rays when they strike a mirror near its edge, in comparison with those that strike close to the centre.
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A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.
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Stereopsis (from the Greek στερεο- stereo- meaning "solid", and ὄψις opsis, "appearance, sight") is a term that is most often used to refer to the perception of depth and 3-dimensional structure obtained on the basis of visual information deriving from two eyes by individuals with normally developed binocular vision.
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In geometry, an angle subtended by an arc, line segment, or other curve is one whose two rays pass through the endpoints of the arc.
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Taurus (Latin for "the Bull") is one of the constellations of the zodiac, which means it is crossed by the plane of the ecliptic.
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Telemetry is an automated communications process by which measurements and other data are collected at remote or inaccessible points and transmitted to receiving equipment for monitoring.
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A telescope is an optical instrument that aids in the observation of remote objects by collecting electromagnetic radiation (such as visible light).
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A telescopic sight, commonly called a scope, is an optical sighting device that is based on a refracting telescope.
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A terrestrial planet, telluric planet, or rocky planet is a planet that is composed primarily of silicate rocks or metals.
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The Parallax View (2006) is a work of critical theory by Slavoj Žižek.
A theodolite is a precision instrument for measuring angles in the horizontal and vertical planes.
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A transit of Venus across the Sun takes place when the planet Venus passes directly between the Sun and a superior planet, becoming visible against (and hence obscuring a small portion of) the solar disk.
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In trigonometry and geometry, triangulation is the process of determining the location of a point by forming triangles to it from known points.
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Trigonometry (from Greek trigōnon, "triangle" and metron, "measure") is a branch of mathematics that studies relationships involving lengths and angles of triangles.
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In geometry, trilateration is the process of determining absolute or relative locations of points by measurement of distances, using the geometry of circles, spheres or triangles.
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A twin-lens reflex camera (TLR) is a type of camera with two objective lenses of the same focal length.
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Tycho Brahe (born Tyge Ottesen Brahe;. He adopted the Latinized form "Tycho Brahe" (sometimes written Tÿcho) at around age fifteen. The name Tycho comes from Tyche (Τύχη, meaning "luck" in Greek, Roman equivalent: Fortuna), a tutelary deity of fortune and prosperity of ancient Greek city cults. He is now generally referred to as "Tycho," as was common in Scandinavia in his time, rather than by his surname "Brahe" (a spurious appellative form of his name, Tycho de Brahe, only appears much later). 14 December 154624 October 1601) was a Danish nobleman, astronomer, and writer known for his accurate and comprehensive astronomical and planetary observations.
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Ulysses is a modernist novel by Irish writer James Joyce.
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In photography, a viewfinder is what the photographer looks through to compose, and, in many cases, to focus the picture.
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Visual perception is the ability to interpret the surrounding environment using light in the visible spectrum reflected by the objects in the environment.
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Wiggle stereoscopy is an example of stereoscopy in which left and right images of a stereogram are animated.
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Windage is a force created on an object by friction when there is relative movement between air and the object.
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Xallarap is a variation in a gravitational lensing observation caused by the orbital motion of the source.
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A year is the orbital period of the Earth moving in its orbit around the Sun.
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1566 Icarus, provisional designation, is an extremely eccentric asteroid, approximately 1.4 kilometers in diameter.
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433 Eros, provisional designation, is a stony and elongated asteroid of the Amor group and the first discovered and second-largest near-Earth object with a mean-diameter of approximately 16.8 kilometers.
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61 Cygni Not to be confused with 16 Cygni, a more distant system containing two G-type stars harboring the gas giant planet 16 Cygni Bb.
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Annual parallax, Diurnal parallax, Equatorial horizontal parallax, Geocentric parallax, Heliocentric parallax, Horizontal parallax, Lunar parallax, Motion parallax, Movement parallax, Paralax, Parallax (astronomy), Parallax error, Parallax method, Parralax, Solar parallax, Stelaar parralax, Trig parallax, Trigonometric parallax.