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NASA’s Astronomy Picture of the Day (APOD) highlighted a striking atmospheric phenomenon known as a circumhorizon arc, often called a 'fire rainbow' due to its vivid, flame-like appearance. This optical display occurs when sunlight refracts through horizontally aligned ice crystals in high-altitude cirrus clouds, creating a vivid spectrum of colors parallel to the horizon. The image was captured in 2021 near North Fork Mountain in West Virginia, USA, showcasing the rarity of such sightings.

The formation of a circumhorizon arc depends on specific conditions: the Sun must be at least 58 degrees above the horizon, and the sky must contain cirrus fibratus clouds composed of flat, hexagonal ice crystals. These crystals must align horizontally to refract sunlight uniformly, a configuration that makes the phenomenon relatively uncommon. The APOD explanation, written by an astronomer, underscores the scientific principles behind the arc’s appearance.

Photographs of circumhorizon arcs are infrequent due to the precise atmospheric requirements needed for their formation. The featured image from West Virginia serves as a visual example of how light and ice crystals interact in the upper atmosphere to produce this stunning optical effect. Such sightings are typically documented by amateur and professional photographers who track rare sky phenomena.

APOD, managed by NASA, provides daily images and explanations of celestial or atmospheric events, curated by professional astronomers. The platform aims to educate the public about the science behind natural phenomena, using high-quality imagery to illustrate complex concepts. Tomorrow’s APOD will feature a different astronomical event, continuing the series’ tradition of showcasing the wonders of the universe.