Moondogs are really no different to sundogs, apart from their brightness. The low intensity means they usually appear colourless, although the brightest ones do show some colour to the eye. With a long enough exposure the image of a moondog is hard to distinguish from a sundog in the daytime, in this case about 300 000 times more exposure was needed.

On this occasion the presence of the halo made it easier to distinguish the moondog from the other clouds.

A number of stars are visible on the larger frame. Antares is just to the right of the moon, three bright stars in the head of Scorpius are emerging from the cloud.

Canon EOS 20D   20th June 2005
Wiltshire, England

Other Halo Topics