What is a halo? Well, according to my sources (known as Wikipedia.org), “A halo is an optical phenomenon that appears near or around the Sun or Moon, and sometimes near other strong light sources such as street lights. There are many types of optical halos, but they are mostly caused by ice crystals in cold cirrus clouds located high in the upper troposphere. The particular shape and orientation of the crystals is responsible for the type of halo observed. Light is reflected and refracted by the ice crystals and may split up into colors because of dispersion, similarly to the rainbow.” Let’s face it, although cool, that’s not what any of us think of when we’re asked “What is a halo?”