A ring or circle of light around the sun or moon is called a halo. Solar and lunar haloes are pretty common, but they're so mysterious-looking that people often express amazement upon seeing them. They want to know: what causes a halo around the sun or moon?
A ring or circle of light around the sun or moon is called a halo. Solar and lunar haloes are pretty common, but they're so mysterious-looking that people often express amazement upon seeing them. They want to know: what causes a halo around the sun or moon?