Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Atmospheric_refraction> ?p ?o }
- Atmospheric_refraction abstract "Atmospheric refraction is the deviation of light or other electromagnetic wave from a straight line as it passes through the atmosphere due to the variation in air density as a function of altitude. This refraction is due to the velocity of light through air decreasing (the index of refraction increases) with increased density. Atmospheric refraction near the ground produces mirages and can make distant objects appear to shimmer or ripple, elevated or lowered, stretched or shortened with no mirage involved. The term also applies to the refraction of sound. Atmospheric refraction is considered in measuring the position of both astronomical and terrestrial objects.Astronomical or celestial refraction causes astronomical objects to appear higher in the sky than they are in reality. Terrestrial refraction usually causes terrestrial objects to appear higher than they really are, although in the afternoon when the air near the ground is heated, the rays can curve upward making objects appear lower than they really are.Refraction not only affects lightrays but all electromagnetic radiation, although in varying degrees (see dispersion in optics). For example, in visible light, blue is more affected than red. This may cause astronomical objects to be spread out into a spectrum in high-resolution images.Whenever possible, astronomers will schedule their observations around the time of culmination of an object when it is highest in the sky. Likewise sailors will never shoot a star which is not at least 20° or more above the horizon. If observations close to the horizon cannot be avoided, it is possible to equip a telescope with control systems to compensate for the shift caused by the refraction. If the dispersion is a problem too, (in case of broadband high-resolution observations) atmospheric refraction correctors can be employed as well (made from pairs of rotating glass prisms). But as the amount of atmospheric refraction is a function of the temperature gradient, the temperature, pressure, and humidity (the amount of water vapour is especially important at mid-infrared wavelengths) the amount of effort needed for a successful compensation can be prohibitive. Surveyors, on the other hand, will often schedule their observations in the afternoon when the magnitude of refraction is minimum.Atmospheric refraction becomes more severe when there are strong temperature gradients, and refraction is not uniform when the atmosphere is inhomogeneous, as when there is turbulence in the air. This is the cause of twinkling of the stars and various deformations of the shape of the sun at sunset and sunrise.".
- Atmospheric_refraction thumbnail Refracción.png?width=300.
- Atmospheric_refraction wikiPageExternalLink thomas.pdf.
- Atmospheric_refraction wikiPageExternalLink astr_refr.html.
- Atmospheric_refraction wikiPageID "1784072".
- Atmospheric_refraction wikiPageLength "16041".
- Atmospheric_refraction wikiPageOutDegree "53".
- Atmospheric_refraction wikiPageRevisionID "701407194".
- Atmospheric_refraction wikiPageWikiLink Alhazen.
- Atmospheric_refraction wikiPageWikiLink Altitude.
- Atmospheric_refraction wikiPageWikiLink Astronomer.
- Atmospheric_refraction wikiPageWikiLink Astronomical_object.
- Atmospheric_refraction wikiPageWikiLink Astronomical_seeing.
- Atmospheric_refraction wikiPageWikiLink Atmosphere.
- Atmospheric_refraction wikiPageWikiLink Atmosphere_of_Earth.
- Atmospheric_refraction wikiPageWikiLink Atmospheric_optics.
- Atmospheric_refraction wikiPageWikiLink Atmospheric_pressure.
- Atmospheric_refraction wikiPageWikiLink Cartography.
- Atmospheric_refraction wikiPageWikiLink Category:Atmospheric_and_ocean_optics.
- Atmospheric_refraction wikiPageWikiLink Category:Observational_astronomy.
- Atmospheric_refraction wikiPageWikiLink Celestial_coordinate_system.
- Atmospheric_refraction wikiPageWikiLink Culmination.
- Atmospheric_refraction wikiPageWikiLink Density_of_air.
- Atmospheric_refraction wikiPageWikiLink Dispersion_(optics).
- Atmospheric_refraction wikiPageWikiLink Electromagnetic_radiation.
- Atmospheric_refraction wikiPageWikiLink Ernest_Shackleton.
- Atmospheric_refraction wikiPageWikiLink File:BennettAtmRefractVsAlt.png.
- Atmospheric_refraction wikiPageWikiLink Horizon.
- Atmospheric_refraction wikiPageWikiLink Horizontal_coordinate_system.
- Atmospheric_refraction wikiPageWikiLink Humidity.
- Atmospheric_refraction wikiPageWikiLink Imperial_Trans-Antarctic_Expedition.
- Atmospheric_refraction wikiPageWikiLink International_Standard_Atmosphere.
- Atmospheric_refraction wikiPageWikiLink Jet_Propulsion_Laboratory.
- Atmospheric_refraction wikiPageWikiLink Lapse_rate.
- Atmospheric_refraction wikiPageWikiLink Light.
- Atmospheric_refraction wikiPageWikiLink Looming_and_similar_refraction_phenomena.
- Atmospheric_refraction wikiPageWikiLink Minute_and_second_of_arc.
- Atmospheric_refraction wikiPageWikiLink Mirage.
- Atmospheric_refraction wikiPageWikiLink Moon.
- Atmospheric_refraction wikiPageWikiLink Parallax.
- Atmospheric_refraction wikiPageWikiLink Pascal_(unit).
- Atmospheric_refraction wikiPageWikiLink Pressure.
- Atmospheric_refraction wikiPageWikiLink Ray_tracing_(physics).
- Atmospheric_refraction wikiPageWikiLink Refraction.
- Atmospheric_refraction wikiPageWikiLink Refraction_(sound).
- Atmospheric_refraction wikiPageWikiLink Refractive_index.
- Atmospheric_refraction wikiPageWikiLink Semidiameter.
- Atmospheric_refraction wikiPageWikiLink Shen_Kuo.
- Atmospheric_refraction wikiPageWikiLink Star.
- Atmospheric_refraction wikiPageWikiLink Sunrise.
- Atmospheric_refraction wikiPageWikiLink Sunset.
- Atmospheric_refraction wikiPageWikiLink Surveying.
- Atmospheric_refraction wikiPageWikiLink Telescope.
- Atmospheric_refraction wikiPageWikiLink Temperature.
- Atmospheric_refraction wikiPageWikiLink Turbulence.
- Atmospheric_refraction wikiPageWikiLink Twinkling.
- Atmospheric_refraction wikiPageWikiLink Water_vapor.
- Atmospheric_refraction wikiPageWikiLink Zenith.
- Atmospheric_refraction wikiPageWikiLink File:Refracción.png.
- Atmospheric_refraction wikiPageWikiLink File:Seeing_Moon.gif.
- Atmospheric_refraction wikiPageWikiLinkText "Atmospheric refraction".
- Atmospheric_refraction wikiPageWikiLinkText "Refraction".
- Atmospheric_refraction wikiPageWikiLinkText "atmospheric refraction".
- Atmospheric_refraction wikiPageWikiLinkText "heat shimmer".
- Atmospheric_refraction wikiPageWikiLinkText "refracted".
- Atmospheric_refraction wikiPageWikiLinkText "refraction".
- Atmospheric_refraction wikiPageUsesTemplate Template:Citation.
- Atmospheric_refraction wikiPageUsesTemplate Template:Cite_journal.
- Atmospheric_refraction wikiPageUsesTemplate Template:Distinguish.
- Atmospheric_refraction wikiPageUsesTemplate Template:Hdl.
- Atmospheric_refraction wikiPageUsesTemplate Template:Reflist.
- Atmospheric_refraction wikiPageUsesTemplate Template:Refn.
- Atmospheric_refraction subject Category:Atmospheric_and_ocean_optics.
- Atmospheric_refraction subject Category:Observational_astronomy.
- Atmospheric_refraction hypernym Deviation.
- Atmospheric_refraction type Sub-discipline.
- Atmospheric_refraction type Thing.
- Atmospheric_refraction comment "Atmospheric refraction is the deviation of light or other electromagnetic wave from a straight line as it passes through the atmosphere due to the variation in air density as a function of altitude. This refraction is due to the velocity of light through air decreasing (the index of refraction increases) with increased density.".
- Atmospheric_refraction label "Atmospheric refraction".
- Atmospheric_refraction differentFrom Atmospheric_diffraction.
- Atmospheric_refraction sameAs Q254634.
- Atmospheric_refraction sameAs الانكسار_في_الغلاف_الجوي.
- Atmospheric_refraction sameAs Рэфракцыя_астранамічная.
- Atmospheric_refraction sameAs Astronomische_Refraktion.
- Atmospheric_refraction sameAs Γήινη_διάθλαση.
- Atmospheric_refraction sameAs Refracción_atmosférica.
- Atmospheric_refraction sameAs Réfraction_atmosphérique.
- Atmospheric_refraction sameAs Atmosferska_refrakcija.
- Atmospheric_refraction sameAs Rifrazione_atmosferica.
- Atmospheric_refraction sameAs 大気差.
- Atmospheric_refraction sameAs 대기_굴절.
- Atmospheric_refraction sameAs Atmosferinė_refrakcija.
- Atmospheric_refraction sameAs Astronomische_refractie.
- Atmospheric_refraction sameAs Refrakcja_atmosferyczna.
- Atmospheric_refraction sameAs Refração_atmosférica.
- Atmospheric_refraction sameAs m.05wmld.
- Atmospheric_refraction sameAs Астрономическая_рефракция.
- Atmospheric_refraction sameAs Atmosferska_refrakcija.
- Atmospheric_refraction sameAs Atmosfärisk_refraktion.
- Atmospheric_refraction sameAs Atmosferik_Kırılma.