Circumhorizon Arc

The video explains the formation of halos and circum horizon arcs in cirrus clouds due to light bending in ice crystals. It highlights the differences between circum horizon arcs and rainbows, noting that arcs occur when the sun is high and in front of the observer, unlike rainbows. The visibility of these arcs depends on factors like cloud thickness and sunlight. Circum horizon arcs are more common in summer but require specific conditions to be visible.

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