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Distorted Moon
Moonrise at Selsey, UK June '05 imaged by Pete Lawrence.
©Pete Lawrence, shown with permission.

Layers of cool air trapped below warmer ones refract the light of the rising moon to make a weak mirage. The cooler layers are visible as dark bands crossing the disk. At top, dispersion creates a green rim. A more powerful mirage could have vertically magnified the rim into a green flash.

Pete Lawrence's Digital Sky
Temperature layers
Green rim
Green flash