Earlier on today, I spotted an twin-sun halo set directly overhead here at Folkestone. Usually the sun is in the middle of the halo but I think sunlight shining through an unusual arrangement of a particular kind of ice crystals that that makes up cirrus enable the main halo to be one side and only white while there is a fainter "traditional" halo around the sun, kind of made it look like a giant wedding ring. I've actually not seen the likes of that before.
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