2 articles
Circumhorizontal arc
The circumhorizontal arc, often called a fire rainbow, is a colorful band of light formed when sunlight refracts through flat, plate-shaped ice crystals in cirrus clouds, visible only where the sun climbs above 58°.
Cirrus cloud
Cirrus is a genus of thin, high-altitude clouds made of ice crystals, appearing as delicate white filaments or bands and covering more than half the planet.