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Naked eye

Index Naked eye

Naked eye, also called bare eye or unaided eye, is the practice of engaging in visual perception unaided by a magnifying or light-collecting optical instrument, such as a telescope or microscope. [1]

95 relations: Accuracy and precision, Adaptation (eye), Alarm signal, Ancient Egypt, Andromeda Galaxy, Angular resolution, Apparent magnitude, Astronomical object, Astronomical seeing, Astronomy, Atmosphere of Earth, Autofocus, Averted vision, Babylonia, Canes Venatici, Canopus, Carina Nebula, Celestial event, Centaurus A, Chinese astronomy, Classical planet, Clock, Comet, Conjunction (astronomy), Corrective lens, Double Cluster, Earth, Equinox, Extinction (astronomy), Field of view, Galilean moons, Galileo Galilei, Geminids, Hercules (constellation), Horizon, Indian astronomy, International Space Station, Jupiter, Latitude, Light pollution, Magnification, Magnifying glass, Maya civilization, Messier 13, Messier 3, Messier 7, Messier 81, Messier 83, Messier 92, Messier object, ..., Meteor shower, Meteorology, Microscope, Milky Way, Minute and second of arc, Moon, Moons of Jupiter, Motion (physics), Near-Earth object, Occultation, Omega Centauri, Optical instrument, Orion Nebula, Perseids, Photometry (optics), Photoreceptor cell, Planet, Planetary phase, Pleiades, Plumb bob, Pole star, Polynesia, Satellite, Scorpius, Sculptor Galaxy, Sirius, Sky, Sky & Telescope, Star, Star cluster, Sternenbote, Sun, Symmetry, Technology, Telescope, Triangulum Galaxy, Turbulence, Tycho Brahe, University of Cambridge, Uranus, Venus, Visual acuity, Visual perception, 4 Vesta, 47 Tucanae. Expand index (45 more) »

Accuracy and precision

Precision is a description of random errors, a measure of statistical variability.

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Adaptation (eye)

In ocular physiology, adaptation is the ability of the eye to adjust to various levels of light.

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Alarm signal

In animal communication, an alarm signal is an antipredator adaptation in the form of signals emitted by social animals in response to danger.

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Ancient Egypt

Ancient Egypt was a civilization of ancient Northeastern Africa, concentrated along the lower reaches of the Nile River - geographically Lower Egypt and Upper Egypt, in the place that is now occupied by the countries of Egypt and Sudan.

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Andromeda Galaxy

The Andromeda Galaxy, also known as Messier 31, M31, or NGC 224, is a spiral galaxy approximately 780 kiloparsecs (2.5 million light-years) from Earth, and the nearest major galaxy to the Milky Way.

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Angular resolution

Angular resolution or spatial resolution describes the ability of any image-forming device such as an optical or radio telescope, a microscope, a camera, or an eye, to distinguish small details of an object, thereby making it a major determinant of image resolution.

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Apparent magnitude

The apparent magnitude of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth.

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Astronomical object

An astronomical object or celestial object is a naturally occurring physical entity, association, or structure that exists in the observable universe.

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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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Astronomy

Astronomy (from ἀστρονομία) is a natural science that studies celestial objects and phenomena.

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Atmosphere of Earth

The atmosphere of Earth is the layer of gases, commonly known as air, that surrounds the planet Earth and is retained by Earth's gravity.

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Autofocus

An autofocus (or AF) optical system uses a sensor, a control system and a motor to focus on an automatically or manually selected point or area.

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Averted vision

Averted vision is a technique for viewing faint objects which uses peripheral vision.

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Babylonia

Babylonia was an ancient Akkadian-speaking state and cultural area based in central-southern Mesopotamia (present-day Iraq).

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Canes Venatici

Canes Venatici is one of the 88 official modern constellations.

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Canopus

Canopus, also designated Alpha Carinae (α Carinae, abbreviated Alpha Car, α Car), is the brightest star in the southern constellation of Carina, and the second-brightest star in the night-time sky, after Sirius.

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Carina Nebula

The Carina Nebula (catalogued as NGC 3372; also known as the Grand Nebula, Great Nebula in Carina, or Eta Carinae Nebula) is a large, complex area of bright and dark nebulosity in the constellation Carina, and is located in the Carina–Sagittarius Arm.

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Celestial event

A celestial event is an astronomical phenomenon of interest that involves one or more celestial objects.

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Centaurus A

Centaurus A or NGC 5128 is a galaxy in the constellation of Centaurus.

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Chinese astronomy

Astronomy in China has a long history, beginning from the Shang Dynasty (Chinese Bronze Age).

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Classical planet

In classical antiquity, the seven classical planets are the seven non-fixed astronomical objects in the sky visible to the naked eye: Mars, Jupiter, Venus, Saturn, Mercury, the Sun, and the Moon.

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Clock

A clock is an instrument to measure, keep, and indicate time.

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Comet

A comet is an icy small Solar System body that, when passing close to the Sun, warms and begins to release gases, a process called outgassing.

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Conjunction (astronomy)

In astronomy, a conjunction occurs when two astronomical objects or spacecraft have either the same right ascension or the same ecliptic longitude, usually as observed from Earth.

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Corrective lens

A corrective lens is a lens typically worn in front of the eye to improve vision.

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Double Cluster

The Double Cluster (also known as Caldwell 14) is the common name for the open clusters NGC 869 and NGC 884 (often designated h Persei and χ Persei, respectively), which are close together in the constellation Perseus.

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Earth

Earth is the third planet from the Sun and the only astronomical object known to harbor life.

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Equinox

An equinox is commonly regarded as the moment the plane (extended indefinitely in all directions) of Earth's equator passes through the center of the Sun, which occurs twice each year, around 20 March and 22-23 September.

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Extinction (astronomy)

In astronomy, extinction is the absorption and scattering of electromagnetic radiation by dust and gas between an emitting astronomical object and the observer.

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Field of view

The field of view is the extent of the observable world that is seen at any given moment.

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Galilean moons

The Galilean moons are the four largest moons of Jupiter—Io, Europa, Ganymede, and Callisto.

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Galileo Galilei

Galileo Galilei (15 February 1564Drake (1978, p. 1). The date of Galileo's birth is given according to the Julian calendar, which was then in force throughout Christendom. In 1582 it was replaced in Italy and several other Catholic countries with the Gregorian calendar. Unless otherwise indicated, dates in this article are given according to the Gregorian calendar. – 8 January 1642) was an Italian polymath.

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Geminids

The Geminids are a meteor shower caused by the object 3200 Phaethon, which is thought to be a Palladian asteroid with a "rock comet" orbit.

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Hercules (constellation)

Hercules is a constellation named after Hercules, the Roman mythological hero adapted from the Greek hero Heracles.

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Horizon

The horizon or skyline is the apparent line that separates earth from sky, the line that divides all visible directions into two categories: those that intersect the Earth's surface, and those that do not.

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Indian astronomy

Indian astronomy has a long history stretching from pre-historic to modern times.

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International Space Station

The International Space Station (ISS) is a space station, or a habitable artificial satellite, in low Earth orbit.

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Jupiter

Jupiter is the fifth planet from the Sun and the largest in the Solar System.

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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 pollution

Light pollution, also known as photopollution, is the presence of anthropogenic light in the night environment.

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Magnification

Magnification is the process of enlarging the appearance, not physical size, of something.

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Magnifying glass

A magnifying glass (called a hand lens in laboratory contexts) is a convex lens that is used to produce a magnified image of an object.

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Maya civilization

The Maya civilization was a Mesoamerican civilization developed by the Maya peoples, and noted for its hieroglyphic script—the only known fully developed writing system of the pre-Columbian Americas—as well as for its art, architecture, mathematics, calendar, and astronomical system.

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Messier 13

Messier 13 (M13), also designated NGC 6205 and sometimes called the Great Globular Cluster in Hercules or the Hercules Globular Cluster, is a globular cluster of several hundred thousand stars in the constellation of Hercules.

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Messier 3

Messier 3 (M3 or NGC 5272) is a globular cluster of stars in the northern constellation of Canes Venatici.

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Messier 7

Messier 7 or M7, also designated NGC 6475 and sometimes known as the Ptolemy Cluster, is an open cluster of stars in the constellation of Scorpius.

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Messier 81

Messier 81 (also known as NGC 3031 or Bode's Galaxy) is a spiral galaxy about 12 million light-years away, in the constellation Ursa Major.

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Messier 83

Messier 83 (also known as the Southern Pinwheel Galaxy, M83 or NGC 5236) is a barred spiral galaxy approximately 15 million light-years away in the constellation Hydra.

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Messier 92

Messier 92 (also known as M92, M 92, or NGC 6341) is a globular cluster of stars in the northern constellation of Hercules.

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Messier object

The Messier objects are a set of 110 astronomical objects, of which 103 were included in lists published by French astronomer Charles Messier in 1771 and 1781.

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Meteor shower

A meteor shower is a celestial event in which a number of meteors are observed to radiate, or originate, from one point in the night sky.

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Meteorology

Meteorology is a branch of the atmospheric sciences which includes atmospheric chemistry and atmospheric physics, with a major focus on weather forecasting.

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Microscope

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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Milky Way

The Milky Way is the galaxy that contains our Solar System.

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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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Moon

The Moon is an astronomical body that orbits planet Earth and is Earth's only permanent natural satellite.

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Moons of Jupiter

There are 69 known moons of Jupiter.

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Motion (physics)

In physics, motion is a change in position of an object over time.

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Near-Earth object

A near-Earth object (NEO) is any small Solar System body whose orbit can bring it into proximity with Earth.

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Occultation

An occultation is an event that occurs when one object is hidden by another object that passes between it and the observer.

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Omega Centauri

Omega Centauri (ω Cen or NGC 5139) is a globular cluster in the constellation of Centaurus that was first identified as a non-stellar object by Edmond Halley in 1677.

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Optical instrument

An optical instrument either processes light waves to enhance an image for viewing, or analyzes light waves (or photons) to determine one of a number of characteristic properties.

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Orion Nebula

The Orion Nebula (also known as Messier 42, M42, or NGC 1976) is a diffuse nebula situated in the Milky Way, being south of Orion's Belt in the constellation of Orion.

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Perseids

The Perseids are prolific meteor showers associated with the comet Swift–Tuttle.

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Photometry (optics)

Photometry is the science of the measurement of light, in terms of its perceived brightness to the human eye.

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Photoreceptor cell

A photoreceptor cell is a specialized type of neuroepithelial cell found in the retina that is capable of visual phototransduction.

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Planet

A planet is an astronomical body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.

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Planetary phase

A planetary phase is a period of time during which a certain portion of a planet's area reflects sunlight from the perspective of a given vantage point.

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Pleiades

The Pleiades (also known as the Seven Sisters and Messier 45), are an open star cluster containing middle-aged, hot B-type stars located in the constellation of Taurus.

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Plumb bob

A plumb bob, or plummet, is a weight, usually with a pointed tip on the bottom, suspended from a string and used as a vertical reference line, or plumb-line.

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Pole star

Pole star or polar star refers to a star, preferably bright, closely aligned to the axis of rotation of an astronomical object.

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Polynesia

Polynesia (from πολύς polys "many" and νῆσος nēsos "island") is a subregion of Oceania, made up of more than 1,000 islands scattered over the central and southern Pacific Ocean.

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Satellite

In the context of spaceflight, a satellite is an artificial object which has been intentionally placed into orbit.

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Scorpius

Scorpius is one of the constellations of the zodiac.

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Sculptor Galaxy

The Sculptor Galaxy, also known as the Silver Coin or Silver Dollar Galaxy, NGC 253, is an intermediate spiral galaxy in the constellation Sculptor.

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Sirius

Sirius (a romanization of Greek Σείριος, Seirios,."glowing" or "scorching") is a star system and the brightest star in the Earth's night sky.

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Sky

The sky (or celestial dome) is everything that lies above the surface of the Earth, including the atmosphere and outer space.

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Sky & Telescope

Sky & Telescope (S&T) is a monthly American magazine covering all aspects of amateur astronomy, including the following.

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Star

A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.

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Star cluster

Star clusters are groups of stars.

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Sternenbote

The Sternenbote is a monthly scientific journal on astronomy published by the Astronomisches Büro (Vienna).

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Sun

The Sun is the star at the center of the Solar System.

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Symmetry

Symmetry (from Greek συμμετρία symmetria "agreement in dimensions, due proportion, arrangement") in everyday language refers to a sense of harmonious and beautiful proportion and balance.

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Technology

Technology ("science of craft", from Greek τέχνη, techne, "art, skill, cunning of hand"; and -λογία, -logia) is first robustly defined by Jacob Bigelow in 1829 as: "...principles, processes, and nomenclatures of the more conspicuous arts, particularly those which involve applications of science, and which may be considered useful, by promoting the benefit of society, together with the emolument of those who pursue 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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Triangulum Galaxy

The Triangulum Galaxy is a spiral galaxy approximately 3 million light-years (ly) from Earth in the constellation Triangulum.

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Turbulence

In fluid dynamics, turbulence or turbulent flow is any pattern of fluid motion characterized by chaotic changes in pressure and flow velocity.

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Tycho Brahe

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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University of Cambridge

The University of Cambridge (informally Cambridge University)The corporate title of the university is The Chancellor, Masters, and Scholars of the University of Cambridge.

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Uranus

Uranus is the seventh planet from the Sun.

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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 perception

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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4 Vesta

Vesta, minor-planet designation 4 Vesta, is one of the largest objects in the asteroid belt, with a mean diameter of.

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47 Tucanae

47 Tucanae, 47 Tuc (or NGC 104) is a globular cluster located in the constellation Tucana.

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Bare eye, Bare eyed, Bare eyes, Bare-eyed, Naked Eye, Naked eye astronomy, Naked eye resolution, Naked eyed, Naked-eye, Naked-eye object, Naked-eye stars, Naked-eyed, Nakedeye, Unaided eye.

References

[1] https://en.wikipedia.org/wiki/Naked_eye

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