Derby and District Astronomical Society

Nacreous Clouds

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DDAS member Mike Dumelow took this picture of nacreous clouds on the 16th February 1996 using a Praktica SLR camera. Nacreous clouds usually form in winter at a height of 15,000-25,000 m, which means they are slow moving. Nacreous refers to their similarity to the iridescence of Nacre, or Mother of Pearl.

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