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Discover the amazing world of clouds with your pocket guide to the wonders of the sky and have your spottings verified as you build your own collection of clouds.  Learn how to spot 58 different cloud formations and optical effects, from the common ones like Cumulus clouds and rainbows to rare ones like the fleeting fluctus cloud or the hard to spot circumzenithal arc. Learn what makes each formation special with expert text from the Cloud Appreciation Society and stunning reference photographs by our app users around the world. Build up your Collection of spottings and gain CloudSpotter Stars as you do so. Our innovative tools will help you decide what type of clouds or optical effects you’ve spotted. You will hear back from the rest of the community whether they think you got your spotting right. You can see New Spottings by other users around the world and say (with our help) if you think they got theirs right. Becoming an expert cloudspotter has never been easier – or more fun! And if you’re a subscribing member of the Cloud Appreciation Society you’ll be able to access our Cloud-a-Days each morning. These feature curated photographs by our members, explanations of the clouds featured, inspiring sky quotations, and even examples of clouds depicted in art. Looking up will never be the same again!