Lunar Elliptical Halo

Small compared to the 22° halo, often faint and fleeting, rare, mysterious, supposedly and improbably made by unphysical crystals.

Images captured by Michael Busse at Hannover, Germany on March 27, '13.

Images ©Michael Busse, shown with permission
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The general behaviour of ellipticals, their variation with sun/moon altitude and their several rings, can be explained by invoking crystals like these. However, the devil is in the details and they are not well explained.