Neutral Point

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Neutral Point

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1. In atmospheric optics, one of several points in the sky for which the degree of polarization of diffuse sky radiation is zero. </dd>
In an ideal Rayleigh atmosphere there would be just two such points, the solar point and the antisolar point. Because of effects of multiple scattering and because of the action of scattering particles larger than molecules, the actual atmosphere is typically found to have quite different neutral points. In the vertical plane containing the observer's zenith and the sun, three neutral points are commonly found: the Arago point, the Babinet point, and the Brewster point. </dd>
2. In aircraft, that location of the center of gravity at which the aircraft would exhibit neutral aerodynamic stability. </dd>
3. = Lagrangian point. </dd>

References

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