Cyanometry

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Cyanometry


The study and measurement of the blueness of the sky.
The characteristic blue color of clear skies is due to preferential scattering of the short wavelength components of visible sunlight by air molecules. Presence of foreign particles in the atmosphere alters the scattering processes in such a way as to reduce the blueness. Hence spectral analysis of diffuse sky radiation provides useful information concerning the scattering particles.

References

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