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101 relations: Adaptive optics, Alex Filippenko, Angle, Angular diameter, Angular unit, ASCII, Astrometry, Astronomical seeing, Astronomical unit, Astronomy, Azimuth, Babylonian astronomy, Ball (association football), Betelgeuse, Binary star, Cardinal direction, Cartography, Celestial navigation, Circumflex, Confidence interval, Decimal, Declination, Degree (angle), Degree symbol, Diffraction-limited system, Dime (United States coin), Dimensionless quantity, Ecliptic coordinate system, Eiffel Tower, Epitaxy, Equator, Equatorial coordinate system, Figure of the Earth, Firearm, Gaia (spacecraft), Geographical mile, Global Positioning System, Gradian, Great circle, Horizontal coordinate system, Hubble Space Telescope, Imperial units, Inch, International System of Units, Latitude, Light-year, Longitude, M24 Sniper Weapon System, Marksman, Meridian (geography), ..., Meridian arc, Metes and bounds, Metric prefix, Metric system, Mile, Milliradian, Minute and second of arc, Mosaicity, Nautical mile, Navigation, Neptune, New York City, Non-SI units mentioned in the SI, Ophthalmology, Optical comparator, Optical engineering, Optics, Optometry, Parallax, Parsec, Pluto, Prime (symbol), Prime meridian, Proper motion, R Doradus, Radian, Radix, Reference ellipsoid, Reticle, Rifle, Right ascension, Sea level, Sexagesimal, Shooting range, Shot grouping, Solid angle, Spatiotemporal pattern, Spheroid, Spotting scope, Subtended angle, Supergiant star, Surveying, Telescope, Telescopic sight, Triton (moon), Turn (geometry), Venus, Visual acuity, Visual angle, X-ray crystallography, Yard. Expand index (51 more) »
Adaptive optics
Adaptive optics (AO) is a technology used to improve the performance of optical systems by reducing the effect of incoming wavefront distortions by deforming a mirror in order to compensate for the distortion.
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Alex Filippenko
Alexei Vladimir "Alex" Filippenko (born July 25, 1958) is an American astrophysicist and professor of astronomy at the University of California, Berkeley.
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Angle
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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Angular diameter
The angular diameter, angular size, apparent diameter, or apparent size is an angular measurement describing how large a sphere or circle appears from a given point of view.
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Angular unit
Throughout history, angles have been measured in many different units.
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ASCII
ASCII, abbreviated from American Standard Code for Information Interchange, is a character encoding standard for electronic communication.
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Astrometry
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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Astronomical seeing
Astronomical seeing is the blurring and twinkling of astronomical objects like stars due to turbulent mixing in the Earth's atmosphere, causing variations of the optical refractive index.
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Astronomical unit
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
Astronomy (from ἀστρονομία) is a natural science that studies celestial objects and phenomena.
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Azimuth
An azimuth (from the pl. form of the Arabic noun "السَّمْت" as-samt, meaning "the direction") is an angular measurement in a spherical coordinate system.
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Babylonian astronomy
The history of astronomy in Mesopotamia, and the world, begins with the Sumerians who developed the earliest writing system—known as cuneiform—around 3500–3200 BC.
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Ball (association football)
A football, soccer ball, or association football ball is the ball used in the sport of association football.
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Betelgeuse
Betelgeuse, also designated Alpha Orionis (α Orionis, abbreviated Alpha Ori, α Ori), is the ninth-brightest star in the night sky and second-brightest in the constellation of Orion.
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Binary star
A binary star is a star system consisting of two stars orbiting around their common barycenter.
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Cardinal direction
The four cardinal directions or cardinal points are the directions north, east, south, and west, commonly denoted by their initials N, E, S, and W. East and west are at right angles to north and south, with east being in the clockwise direction of rotation from north and west being directly opposite east.
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Cartography
Cartography (from Greek χάρτης chartēs, "papyrus, sheet of paper, map"; and γράφειν graphein, "write") is the study and practice of making maps.
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Celestial navigation
Celestial navigation, also known as astronavigation, is the ancient and modern practice of position fixing that enables a navigator to transition through a space without having to rely on estimated calculations, or dead reckoning, to know their position.
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Circumflex
The circumflex is a diacritic in the Latin, Greek and Cyrillic scripts that is used in the written forms of many languages and in various romanization and transcription schemes.
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Confidence interval
In statistics, a confidence interval (CI) is a type of interval estimate, computed from the statistics of the observed data, that might contain the true value of an unknown population parameter.
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Decimal
The decimal numeral system (also called base-ten positional numeral system, and occasionally called denary) is the standard system for denoting integer and non-integer numbers.
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Declination
In astronomy, declination (abbreviated dec; symbol δ) is one of the two angles that locate a point on the celestial sphere in the equatorial coordinate system, the other being hour angle.
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Degree (angle)
A degree (in full, a degree of arc, arc degree, or arcdegree), usually denoted by ° (the degree symbol), is a measurement of a plane angle, defined so that a full rotation is 360 degrees.
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Degree symbol
The degree symbol (°) is a typographical symbol that is used, among other things, to represent degrees of arc (e.g. in geographic coordinate systems), hours (in the medical field), degrees of temperature, alcohol proof, or diminished quality in musical harmony.
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Diffraction-limited system
The resolution of an optical imaging system a microscope, telescope, or camera can be limited by factors such as imperfections in the lenses or misalignment.
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Dime (United States coin)
The dime, in U.S. usage, is a ten-cent coin, one tenth of a United States dollar, labeled formally as "one dime".
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Dimensionless quantity
In dimensional analysis, a dimensionless quantity is a quantity to which no physical dimension is assigned.
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Ecliptic coordinate system
The ecliptic coordinate system is a celestial coordinate system commonly used for representing the apparent positions and orbits of Solar System objects.
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Eiffel Tower
The Eiffel Tower (tour Eiffel) is a wrought iron lattice tower on the Champ de Mars in Paris, France.
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Epitaxy
Epitaxy refers to the deposition of a crystalline overlayer on a crystalline substrate.
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Equator
An equator of a rotating spheroid (such as a planet) is its zeroth circle of latitude (parallel).
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Equatorial coordinate system
The equatorial coordinate system is a celestial coordinate system widely used to specify the positions of celestial objects.
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Figure of the Earth
The figure of the Earth is the size and shape of the Earth in geodesy.
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Firearm
A firearm is a portable gun (a barreled ranged weapon) that inflicts damage on targets by launching one or more projectiles driven by rapidly expanding high-pressure gas produced by exothermic combustion (deflagration) of propellant within an ammunition cartridge.
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Gaia (spacecraft)
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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Geographical mile
The geographical mile is a unit of length determined by 1 minute of arc along the Earth's equator.
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Global Positioning System
The Global Positioning System (GPS), originally Navstar GPS, is a satellite-based radionavigation system owned by the United States government and operated by the United States Air Force.
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Gradian
The gradian is a unit of measurement of an angle, equivalent to \frac of a turn, \frac of a degree, or \frac of a radian.
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Great circle
A great circle, also known as an orthodrome, of a sphere is the intersection of the sphere and a plane that passes through the center point of the sphere.
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Horizontal coordinate system
The horizontal coordinate system is a celestial coordinate system that uses the observer's local horizon as the fundamental plane.
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Hubble Space Telescope
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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Imperial units
The system of imperial units or the imperial system (also known as British Imperial or Exchequer Standards of 1825) is the system of units first defined in the British Weights and Measures Act of 1824, which was later refined and reduced.
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Inch
The inch (abbreviation: in or &Prime) is a unit of length in the (British) imperial and United States customary systems of measurement now formally equal to yard but usually understood as of a foot.
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International System of Units
The International System of Units (SI, abbreviated from the French Système international (d'unités)) is the modern form of the metric system, and is the most widely used system of measurement.
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Latitude
In geography, latitude is a geographic coordinate that specifies the north–south position of a point on the Earth's surface.
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Light-year
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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Longitude
Longitude, is a geographic coordinate that specifies the east-west position of a point on the Earth's surface.
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M24 Sniper Weapon System
The M24 Sniper Weapon System (SWS) is the military and police version of the Remington Model 700 rifle, M24 being the model name assigned by the United States Army after adoption as their standard sniper rifle in 1988.
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Marksman
A marksman is a person who is skilled in precision shooting, using accurate precision scoped projectile weapons (in modern days most commonly a designated marksman rifle or a sniper rifle) to shoot at high-value targets at longer-than-usual ranges.
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Meridian (geography)
A (geographical) meridian (or line of longitude) is the half of an imaginary great circle on the Earth's surface, terminated by the North Pole and the South Pole, connecting points of equal longitude.
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Meridian arc
In geodesy, a meridian arc measurement is the distance between two points with the same longitude, i.e., a segment of a meridian curve or its length.
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Metes and bounds
Metes and bounds is a system or method of describing land, real property (in contrast to personal property) or real estate.
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Metric prefix
A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple or fraction of the unit.
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Metric system
The metric system is an internationally adopted decimal system of measurement.
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Mile
The mile is an English unit of length of linear measure equal to 5,280 feet, or 1,760 yards, and standardised as exactly 1,609.344 metres by international agreement in 1959.
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Milliradian
A milliradian, often called a mil or mrad, is an SI derived unit for angular measurement which is defined as a thousandth of a radian (0.001 radian).
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Minute and second of arc
A minute of arc, arcminute (arcmin), arc minute, or minute arc is a unit of angular measurement equal to of one degree.
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Mosaicity
In crystallography, mosaicity is a measure of the spread of crystal plane orientations.
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Nautical mile
A nautical mile is a unit of measurement defined as exactly.
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Navigation
Navigation is a field of study that focuses on the process of monitoring and controlling the movement of a craft or vehicle from one place to another.
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Neptune
Neptune is the eighth and farthest known planet from the Sun in the Solar System.
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New York City
The City of New York, often called New York City (NYC) or simply New York, is the most populous city in the United States.
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Non-SI units mentioned in the SI
This is a list of units that are not defined as part of the International System of Units (SI), but are otherwise mentioned in the SI, because either the General Conference on Weights and Measures (CGPM) accepts their use as being multiples or submultiples of SI-units, they have important contemporary application worldwide, or are otherwise commonly encountered worldwide.
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Ophthalmology
Ophthalmology is a branch of medicine and surgery (both methods are used) that deals with the anatomy, physiology and diseases of the eyeball and orbit.
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Optical comparator
An optical comparator (often called just a comparator in context) is a device that applies the principles of optics to the inspection of manufactured parts.
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Optical engineering
Optical engineering is the field of study that focuses on applications of optics.
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Optics
Optics is the branch of physics which involves the behaviour and properties of light, including its interactions with matter and the construction of instruments that use or detect it.
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Optometry
Optometry is a health care profession which involves examining the eyes and applicable visual systems for defects or abnormalities as well as the medical diagnosis and management of eye disease.
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Parallax
Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines.
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Parsec
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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Pluto
Pluto (minor planet designation: 134340 Pluto) is a dwarf planet in the Kuiper belt, a ring of bodies beyond Neptune.
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Prime (symbol)
The prime symbol (′), double prime symbol (&Prime), triple prime symbol (‴), quadruple prime symbol (⁗) etc., are used to designate units and for other purposes in mathematics, the sciences, linguistics and music.
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Prime meridian
A prime meridian is a meridian (a line of longitude) in a geographic coordinate system at which longitude is defined to be 0°.
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Proper motion
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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R Doradus
R Doradus (HD 29712 or P Doradus) is the name of a red giant Mira variable star in the far-southern constellation Dorado, although visually it appears more closely associated with the constellation Reticulum.
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Radian
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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Radix
In mathematical numeral systems, the radix or base is the number of unique digits, including zero, used to represent numbers in a positional numeral system.
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Reference ellipsoid
In geodesy, a reference ellipsoid is a mathematically defined surface that approximates the geoid, the truer figure of the Earth, or other planetary body.
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Reticle
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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Rifle
A rifle is a portable long-barrelled firearm designed for precision shooting, to be held with both hands and braced against the shoulder for stability during firing, and with a barrel that has a helical pattern of grooves ("rifling") cut into the bore walls.
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Right ascension
Right ascension (abbreviated RA; symbol) is the angular distance measured only eastward along the celestial equator from the Sun at the March equinox to the (hour circle of the) point above the earth in question.
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Sea level
Mean sea level (MSL) (often shortened to sea level) is an average level of the surface of one or more of Earth's oceans from which heights such as elevations may be measured.
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Sexagesimal
Sexagesimal (base 60) is a numeral system with sixty as its base.
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Shooting range
A shooting range or firing range or archery range or pistol range or rifle range or shooting gallery or shooting ground is a specialized facility designed for archery or firearms practice.
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Shot grouping
In shooting sports, a shot grouping, or simply grouping, is the pattern of projectile impacts on a target from multiple shots taken in one shooting session.
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Solid angle
In geometry, a solid angle (symbol) is a measure of the amount of the field of view from some particular point that a given object covers.
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Spatiotemporal pattern
Spatialtemporal patterns are patterns that occur in a wide range of natural phenoma and are characterized by a spatial and a temporal patterning.
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Spheroid
A spheroid, or ellipsoid of revolution, is a quadric surface obtained by rotating an ellipse about one of its principal axes; in other words, an ellipsoid with two equal semi-diameters.
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Spotting scope
A spotting scope is a small portable high-power telescope with added optics to present an erect image, optimized for the observation of terrestrial objects.
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Subtended angle
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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Supergiant star
Supergiants are among the most massive and most luminous stars.
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Surveying
Surveying or land surveying is the technique, profession, and science of determining the terrestrial or three-dimensional positions of points and the distances and angles between them.
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Telescope
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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Telescopic sight
A telescopic sight, commonly called a scope, is an optical sighting device that is based on a refracting telescope.
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Triton (moon)
Triton is the largest natural satellite of the planet Neptune, and the first Neptunian moon to be discovered.
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Turn (geometry)
A turn is a unit of plane angle measurement equal to 2pi radians, 360 degrees or 400 gradians.
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Venus
Venus is the second planet from the Sun, orbiting it every 224.7 Earth days.
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Visual acuity
Visual acuity (VA) commonly refers to the clarity of vision.
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Visual angle
The visual angle is the angle a viewed object subtends at the eye, usually stated in degrees of arc.
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X-ray crystallography
X-ray crystallography is a technique used for determining the atomic and molecular structure of a crystal, in which the crystalline atoms cause a beam of incident X-rays to diffract into many specific directions.
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Yard
The yard (abbreviation: yd) is an English unit of length, in both the British imperial and US customary systems of measurement, that comprises 3 feet or 36 inches.
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Redirects here:
Arc min, Arc minute, Arc of minute, Arc second, Arc seconds, Arc-fourth, Arc-minute, Arc-second, Arc-third, Arcfourth, Arcmin, Arcminute, Arcminutes, Arcsec (angle unit), Arcsec (unit), Arcsecond, Arcseconds, Arcthird, Asec (angle unit), Asec (unit), Fourths (angle), Microarcsecond, Milliarcsecond, Milliarcseconds, Minut (angle), Minute (angle), Minute (arc), Minute of Angle, Minute of Arc, Minute of a circle, Minute of angle, Minute of arc, Minutes (angle), Minutes of angle, Minutes of arc, Moment of angle, Partes minutae primae, Partes minutae secundae, Second (angle), Second (arc), Second of angle, Second of arc, Seconds (angle), Sub-MOA, Thirds (angle), Μas.
References
[1] https://en.wikipedia.org/wiki/Minute_and_second_of_arc
