Yes, the position of the sun can affect the appearance of dark or light clouds. When the sun is low on the horizon, such as at sunrise or sunset, more of the Earth's atmosphere is required to reach the clouds. This can make the clouds appear more lit and bright, or even reddish or orange in colour. When the sun is high in the sky, the light penetrates through less of the atmosphere, making the clouds appear darker and more foreboding.
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