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The sky appears blue to the human eye as the short waves of blue light are scattered more than the other colours in the spectrum, making the blue light more visible.
All high clouds are a type of cirrus, a common cloud that can be seen at any time of the year.
Noctilucent clouds are extremely rare very high clouds seen in the night sky, usually on clear, summer nights. They become visible about the same time as the brightest stars and are usually bluish or silvery.
Taking a caravan or boat on holiday can be great fun, but getting there requires extra driving skill and some amount of preparation, especially if your caravan has been idle for a while.
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