A simple theory of certain heliacal and anthelic halo arcs. The long hexagonal ice prism as a kaleidoscope

摘要

AbstractG. H. Liljequist and J. R. Blake have both recorded anthelic halo arcs on several occasions in Antarctica, with the sun at comparatively low elevations, which exclude on some occasions, and almost exclude on others, the mechanism put forward by Alfred Wegener to account for such arcs. A particularly complete display reported by J. R. Blake enables these arcs to be identified with those predicted by a very simple theory giver in the following paper, to which are added some remarks about the formation of an anthelion.