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58 relations: Alnitak, Alpha Centauri, Alphard, Altair, Andromeda Galaxy, Angular aperture, Angular diameter distance, Angular resolution, Astronomical object, Astronomical unit, Astronomy, Betelgeuse, Canopus, Ceres (dwarf planet), Circle, Deep-sky object, Degree (angle), Deneb, Distance measures (cosmology), Eagle Nebula, Earth, Earth's orbit, Eris (dwarf planet), Galaxy, Helix Nebula, Hubble Space Telescope, Jupiter, Lens (optics), Light-year, List of stars with resolved images, Long-exposure photography, Mars, Mercury (planet), Minute and second of arc, Moon, Nebula, Neptune, Optics, Parsec, Perceived visual angle, Planet Nine, Pluto, Proxima Centauri, R Doradus, Radian, Saturn, Sirius, Small Magellanic Cloud, Small-angle approximation, Solid angle, ..., Sphere, Sun, Uranus, Venus, Vision science, Visual acuity, Visual angle, 4 Vesta. Expand index (8 more) »
Alnitak
Alnitak, designated Zeta Orionis (ζ Orionis, abbreviated Zeta Ori, ζ Ori) and 50 Orionis (50 Ori), is a multiple star several hundred parsecs from the Sun in the constellation of Orion.
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Alpha Centauri
Alpha Centauri (α Centauri, abbreviated Alf Cen or α Cen) is the star system closest to the Solar System, being from the Sun.
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Alphard
Alphard, also designated Alpha Hydrae (α Hydrae, abbreviated Alpha Hya, α Hya) is the brightest star in the constellation of Hydra.
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Altair
Altair, also designated Alpha Aquilae (α Aquilae, abbreviated Alpha Aql, α Aql), is the brightest star in the constellation of Aquila and the twelfth brightest star in the night sky.
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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 aperture
The angular aperture of a lens is the angular size of the lens aperture as seen from the focal point: where.
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Angular diameter distance
The angular diameter distance is a distance measure used in astronomy.
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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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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 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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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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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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Ceres (dwarf planet)
Ceres (minor-planet designation: 1 Ceres) is the largest object in the asteroid belt that lies between the orbits of Mars and Jupiter, slightly closer to Mars' orbit.
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Circle
A circle is a simple closed shape.
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Deep-sky object
Deep-sky object (abbreviated as DSO) is a term designating any astronomical object that is not an individual star or Solar System object (such as Sun, Moon, planet, comet, etc.). The classification is used for the most part by amateur astronomers to denote visually observed faint naked eye and telescopic objects such as star clusters, nebulae and galaxies.
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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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Deneb
Deneb, also designated α Cygni (Latinised alpha Cygni, abbreviated Alpha Cyg, α Cyg), is the brightest star in the constellation of Cygnus.
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Distance measures (cosmology)
Distance measures are used in physical cosmology to give a natural notion of the distance between two objects or events in the universe.
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Eagle Nebula
The Eagle Nebula (catalogued as Messier 16 or M16, and as NGC 6611, and also known as the Star Queen Nebula and The Spire) is a young open cluster of stars in the constellation Serpens, discovered by Jean-Philippe de Chéseaux in 1745–46.
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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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Earth's orbit
Earth's orbit is the trajectory along which Earth travels around the Sun.
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Eris (dwarf planet)
Eris (minor-planet designation 136199 Eris) is the most massive and second-largest (by volume) dwarf planet in the known Solar System.
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Galaxy
A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter.
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Helix Nebula
The Helix Nebula, also known as The Helix, NGC 7293, is a large planetary nebula (PN) located in the constellation Aquarius.
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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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Jupiter
Jupiter is the fifth planet from the Sun and the largest in the Solar System.
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Lens (optics)
A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction.
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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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List of stars with resolved images
The following is a list of stars whose images have been resolved beyond a point source.
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Long-exposure photography
Long-exposure, time-exposure, or slow-shutter photography involves using a long-duration shutter speed to sharply capture the stationary elements of images while blurring, smearing, or obscuring the moving elements.
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Mars
Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System after Mercury.
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Mercury (planet)
Mercury is the smallest and innermost planet in the 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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Nebula
A nebula (Latin for "cloud" or "fog"; pl. nebulae, nebulæ, or nebulas) is an interstellar cloud of dust, hydrogen, helium and other ionized gases.
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Neptune
Neptune is the eighth and farthest known planet from the Sun in the Solar System.
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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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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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Perceived visual angle
In human visual perception, the visual angle, denoted θ, subtended by a viewed object sometimes looks larger or smaller than its actual value.
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Planet Nine
Planet Nine is a hypothetical planet in the outer region of 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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Proxima Centauri
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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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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Saturn
Saturn is the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter.
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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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Small Magellanic Cloud
The Small Magellanic Cloud (SMC), or Nubecula Minor, is a dwarf galaxy near the Milky Way.
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Small-angle approximation
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.
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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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Sphere
A sphere (from Greek σφαῖρα — sphaira, "globe, ball") is a perfectly round geometrical object in three-dimensional space that is the surface of a completely round ball (viz., analogous to the circular objects in two dimensions, where a "circle" circumscribes its "disk").
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Sun
The Sun is the star at the center of the Solar System.
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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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Vision science
Vision science is the scientific study of vision.
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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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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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Redirects here:
Angular Size, Angular diameter in astronomy, Angular radius, Angular size, Apparent diameter, Apparent size, Defect of illumination, Planetary Diameter, Planetary diameter, Planetary diameters.
References
[1] https://en.wikipedia.org/wiki/Angular_diameter
