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Setting Sun Eastern Parelius ("Sundog") Close Up, Framed by Mounts Planjava and Brana; Kamniško-Savinjske Alpe, Northern Slovenia

06-December-2022

 

When sunlight crosses the earth's atmosphere, during very cold days or in conditions of limited cloud cover with cirrus clouds at high altitudes, it is refracted by the hexagonal ice crystals in suspension that bend the light beam with a angle of 21.54° for red and 22.37° for blue: therefore a Circular Halo is formed at 22° from the Sun whose color degrades from red (inside the halo) to blue (outwards).

 

The two bright spots, diametrically opposite the Sun at a distance of 22°, are the "Pareli".

 

In this case the other Parelius, the western one, was half-hidden by low clouds.

 

 

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Uploaded on December 22, 2022
Taken on December 6, 2022