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#atmosphericoptics 2.3 This image was selected between the best 101 space.com #stargazers #astrophography of the year 2015 https://www.space.com/30803-101-best-night-sky-photos-2015.html It was OPOD and Les Cowley described it as a life time event. Text source: https://www.atoptics.co.uk/fza26.htm Ice crystals acting as millions of small mirrors produced reflections of distant town lights in the sky. Hexagonal plate crystals drift in clouds with their large faces nearly horizontal. They mirror the sun to form sun pillars but here they mirror upward shining ground lights to produce fragments of light pillars. Unlike sun pillars, these light reflections do not need wobbly crystals. If we (reasonably) assume that the crystals were midway between the town lights and Sergio than we can calculate the crystal height from measurements of the image and knowledge of the camera and lens. The height comes out as 4.6km (15,000ft) quite reasonable for ice bearing clouds in winter - The ground temperature was 5-10 Celsius #twanight #natgeo #bbcearth #earthfocus #earthporn #lightpollution #argentina #Astronomy #science #travel #nightphotography #nightscape #natgeocreative #natgeolatam
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