Upper Tangent Arc Above Orsta, Norway
June 01, 2007
The sporty upper tangent arc shown above was captured near sunset, on February 13, 2007, from Ørsta, Norway. Arcs tangent to the 22 degree halo are formed by pencil-shaped hexagonal ice crystals found in cirrus clouds. See also the Earth Science Picture of the Day for December 28, 2006.