bn:00186820n
Noun Concept
Categories: Atmospheric optical phenomena
EN
tangent arc  Upper tangent arc  lower tangent arc  Upper and lower tangent arcs
EN
Tangent arcs are a type of halo, an atmospheric optical phenomenon, which appears above and below the observed Sun or Moon, tangent to the 22° halo. Wikipedia
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EN
Tangent arcs are a type of halo, an atmospheric optical phenomenon, which appears above and below the observed Sun or Moon, tangent to the 22° halo. Wikipedia