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Noctilucent Cloud Structure ID Image | by Nightskyhunter On Flickr
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Noctilucent Cloud Structure ID Image

Just made this Noctilucent Cloud structure idenitification chart to help observers learn to recognize specific NLC forms such Veil, Whirls, Lacunous Holes, Knots etc. Please note that not all NLC forms are visible here. Copyright www.nightskyhunter.com

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Taken on May 18, 2012