I think this shit is pretty cool and I just learned about it today
spectre of the Brocken is the magnified (and apparently enormous) shadow of an observer cast in mid air upon any type of cloudopposite a strong light source. Additionally, if the cloud consists of water droplets backscattered, a bright area called Heiligenschein, and halo-like rings of rainbow coloured light called a glory can be seen around the head or apperature silhouette of the spectre. Typically the spectre appears in sunlightopposite the sun's direction at the antisolar point