Babinet Point

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Babinet Point

One of the three commonly detectable points of zero polarization of diffuse sky radiation, neutral points, lying along the vertical circle through the sun; the other two are the Arago point and Brewster point.
The Babinet point typically lies only 15 to 20 above the sun, and hence is difficult to observe because of solar glare. The existence of this neutral point was discovered by Babinet in 1840.

References

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