Josh Blash caught this omega stage of an inferior mirage sunset on November 27, 2015 at Venice Beach, California. Les Cowley at the website Atmospheric Optics explains omega sunsets this way:
As the sun descends a second sun rises from the water. Eventually the two join at a red hued vertically stretched ‘stem.’ Jules Verne likened this appearance to an Etruscan vase. The stem shortens and thickens until the two suns appear like a Greek letter omega …
The lower sun is not a reflection from the water. It is an ‘inferior mirage’, so named not from any poverty in appearance but because the miraged sun is below the ‘real’ one. The lower sun is an inverted image produced by refraction by a layer of warmer and less dense air close to the ocean surface. The discus shape is a combination of the upper limb of the erect sun and an inverted image of it beneath.
Our thanks to Les and to Josh, who pointed out that Carl Sagan once said:
It does no harm to the romance of the sunset to know a little bit about it.
Bottom line: Omega sunset seen over Venice Beach, California in November, 2015.