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During broad daylight, the sky is blue due to Rayleigh scattering, while around sunrise or sunset, and especially during twilight, absorption of irradiation by ozone helps maintain blue color in the evening sky. At sunrise or sunset, tangentially incident solar rays illuminate clouds with orange to red hues.
The painting measures 50.4 cm × 101.3 cm (19.8 in × 39.9 in). It depicts a relatively flat and featureless landscape with fields of green wheat, under a foreboding dark blue sky with a few heavy white clouds. The horizon divides the work almost into two, with shades of green and yellow below and shades of blue and white above.
Noctilucent clouds are generally colourless or pale blue, [51] although occasionally other colours including red and green have been observed. [52] The characteristic blue colour comes from absorption by ozone in the path of the sunlight illuminating the noctilucent cloud. [53]
The scattering of direct sunlight on those clouds results in the same polarization pattern. In other words, the proportion of the sky that follows the Rayleigh Sky Model is high for both clear skies and cloudy skies. The pattern is also clearly visible in small visible patches of sky. The celestial angle of polarization is unaffected by clouds.
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Particles in the air scatter short-wavelength light (blue and green) through Rayleigh scattering much more strongly than longer-wavelength yellow and red light. Loosely, the term crepuscular rays is sometimes extended to the general phenomenon of rays of sunlight that appear to converge at a point in the sky, irrespective of time of day. [3] [4]
For example, thunderstorm clouds can be green and nobody knows why, dandruff floating in the atmosphere helps form clouds, and a cloudless sky can be called “enubilous”. Pollen, algae, fur ...
View of the night sky in July The day's blue sky, clouds and the Moon. The sky is an unobstructed view upward from the surface of the Earth. It includes the atmosphere and outer space. It may also be considered a place between the ground and outer space, thus distinct from outer space.