Many papers have been devoted to the investigation of twilight phenomena, but they have been mainly of a descriptive nature. Conclusions about the optical properties of the upper atmosphere, which, it would seem, should be the principal goal of twilight research, are usually drawn in a highly elementary manner, on the basis of rather arbitrary simplifying assumptions. The optical properties of twilight are incomparably more complex than those of the daytime sky.
KeywordsSolar Disk Symmetric Point Atmospheric Ozone Noctilucent Cloud Zenith Distance
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