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Optical Effects
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During a Red Arrows flying display rehearsal, Alan realized when reviewing his photographs that he had also captured this vibrant sun dog (parhelion), spotted over RAF Lossiemouth, Moray, Scotland
22-degree halo spotted over Berkeley, California, US
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A classic example of a horseshoe vortex spotted by Lesleigh Griffin, which was observed for eight minutes from a beach near Penguin, Tasmania, Australia
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A mirror reflection in the water that also has a matching element to it, between the clouds and the snow on the ground, spotted near El Chaltén, Argentina
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Undulatus spotted over Jiangsu, China
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Altocumulus lenticularis spotted over Gaw Hill, Ormskirk, England
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Virga spotted at sunset over Black Mountain Tower, near Parkes, Canberra, Australia
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Cumulus fractus that Yu-Tung describes as possessing a whimsical, airy quality that takes on a shape reminiscent of a playful poodle, and adding a touch of natural softness to the urban environs over Sanxia, New Taipei City, Taiwan
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Cirrus resembling smoke coming from a chimney, spotted over Montgomery Village, Santa Rosa, California, US
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A vibrant, multi-ring corona spotted over Brighton, Colorado, US
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Multiple contrails populate the sky on a cold day near Lynchburg, Ohio, US
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A cone of cotton candy, as described by Holly, also known as candy floss, spotted over Longmont, Colorado, US
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A developing storm over Hamburg, Germany
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A classic example of Mammatus (Mamma) spotted in a colourful light over Wells, Somerset, England
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Cumulonimbus spotted over Leiden, The Netherlands
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Asperitas spotted over Northern Illinois, US
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