Twilight phenomena are very complex, since the brightness observed at any point in the sky is the sum of the brightnesses of the primary twilight segment and of higher-order scattering, to which, when the sun has sunk sufficiently below the horizon, we must add the background of the night sky — primarily zodiacal light.
KeywordsVertical Circle Symmetric Point Aerosol Component Noctilucent Cloud Zenith Distance
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