A ring of light encircling the sun or moon could be either
A) a rainbow or a halo.
B) a halo or a sundog.
C) a halo or a corona.
D) a sundog or a crepuscular ray.

Question

Quizplus · Accepted Answer

A ring of light encircling the sun or moon is most commonly referred to as a halo or a corona. While a halo is caused by the refraction of light through ice crystals in the atmosphere, a corona is caused by the diffraction of light around the edges of small particles in the atmosphere, such as water droplets or dust. None of the other options mentioned (rainbow, sundog, or crepuscular ray) describe a ring of light encircling the sun or moon.

A Ring of Light Encircling the Sun or Moon Could