Sunshine

From Glossary of Meteorology



sunshine

Direct radiation from the sun, as opposed to the shading of a location by clouds or by other obstructions.

Because of variations in atmospheric turbidity (alone and in conjunction with the optical air mass), and because of the variable optical thickness of clouds, the distinction between sunshine and lack of sunshine is an arbitrary one that is largely dependent upon the type of sunshine recorder in use or upon the quality of subjective estimates.


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