Halos are often the result of ice crystals in cirrus clouds. When moon or sunlight shines through these crystals, the light ...

Experts say that rings around the moon can pop up from time to time, but have you ever seen one in Denver? Last night, at ...

but the latter are rainbow-colored discs that form when moonlight (or sunlight) interacts with water droplets in fog. Coronas also tend to circle tighter around the moon, creating a 10-degree ...

A moon dog occurs at night in the winter when the moon is full, or near full, casting light through high clouds.