Brewster point

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Brewster point

One of the three commonly detectable points of zero polarization of skylight, neutral points, along the vertical circle through the sun; the other two are the Arago point and Babinet point.

This neutral point, discovered by Brewster in 1840, is located about 15°–20° directly below the sun; hence it is difficult to observe because of the glare of the sun.

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