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atmospheric refraction
atmospheric refraction The displacement in apparent direction of a celestial object caused by the refraction of its light in passing through the Earth's atmosphere. Refraction increases the observed altitude of an object. For an object on the horizon, the amount is about 34' (i.e. just over half a degree). According to a simple atmospheric model, the refraction at zenith distances up to about 45° is proportional to the tangent of the zenith distance, but the exact figure depends on the atmospheric pressure, temperature, and humidity. See also Horizontal Refraction.
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"atmospheric refraction." A Dictionary of Astronomy. 1997. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>. "atmospheric refraction." A Dictionary of Astronomy. 1997. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1O80-atmosphericrefraction.html "atmospheric refraction." A Dictionary of Astronomy. 1997. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O80-atmosphericrefraction.html |
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refraction, atmospheric
refraction, atmospheric See atmospheric refraction.
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"refraction, atmospheric." A Dictionary of Astronomy. 1997. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>. "refraction, atmospheric." A Dictionary of Astronomy. 1997. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1O80-refractionatmospheric.html "refraction, atmospheric." A Dictionary of Astronomy. 1997. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O80-refractionatmospheric.html |
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