Ice crystals in the air are responsible for producing haloes, sun pillars, and sun dogs.
Water droplets are responsible for producing glories.
A halo and sun pillar are evident in this photograph. The sun is located just above the upper edge of the picture. The setting sun is left of center, but near the right edge of the picture there is a bright spot on the horizon and a bright colored area in the clouds above the spot. The glory surrounds the shadow of the airplane in the clouds below and consists of a brightly colored circle of light.