Arago point: Difference between revisions
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|Display title=Arago point | |||
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|Meaning=One of the three commonly detectable points along the vertical circle through the sun at which the [[degree of polarization]] of [[skylight]] goes to zero; a [[neutral point]]. | |||
|Explanation=The Arago point, so named for its discoverer, is customarily located at about 20° above the [[antisolar point]], but it lies at higher elevations in turbid air. The latter property makes the [[Arago distance|Arago distance]] a useful measure of atmospheric [[turbidity]]. Measurements of the location of this neutral point are typically more easily carried out than measurements of the [[Babinet point]] and the [[Brewster point|Brewster point]], both of which lie so close to the sun (about 20° above and below the sun, respectively) that [[glare]] problems become serious.<br/> Neuberger, H. 1951. Introduction to Physical Meteorology. 196–204. | |||
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Latest revision as of 21:31, 13 January 2024
One of the three commonly detectable points along the vertical circle through the sun at which the degree of polarization of skylight goes to zero; a neutral point.
The Arago point, so named for its discoverer, is customarily located at about 20° above the antisolar point, but it lies at higher elevations in turbid air. The latter property makes the Arago distance a useful measure of atmospheric turbidity. Measurements of the location of this neutral point are typically more easily carried out than measurements of the Babinet point and the Brewster point, both of which lie so close to the sun (about 20° above and below the sun, respectively) that glare problems become serious.
Neuberger, H. 1951. Introduction to Physical Meteorology. 196–204.
