https://www.odditycentral.com/tag/optical-phenomenon
optical phenomenon | Oddity Central - Collecting Oddities
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https://www.ibtimes.co.uk/mexico-halo-sun-optical-phenomenon-triggers-apocalypse-ufo-fears-1502566
Mexico: Halo sun from optical phenomenon triggers apocalypse and UFO fears | IBTimes UK
May 22, 2015 - Natural weather phenomenon lead sun in Mexico City to be surrounded by a halo.