The moon dog, moondog, or mock moon (scientific name paraselene, meaning “beside the moon”) is a comparatively rare circular point on a lunar halo caused, in cirrus or cirrhostratus clouds, by refraction of lunar luminous ice by the moonlight of hexagonal ice crystals. As part of the 22° halo, moon dogs appear, approximately 10 Moon beyond the Moon diameters. It is… Read more →
