Brewster Point

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Brewster Point

One of the three commonly detectable points of zero polarization of diffuse sky radiation, 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 to 20 directly below the sun; hence it is difficult to observe because of the glare of the sun.

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use