The 46° halo was first explained as being caused by refractions through ice crystals in 1679 by the French physicist Edmé Mariotte (1620–1684). See: Mariotte, Quatrieme Essay. De la Nature des Couleur (Paris, France: Estienne Michallet, 1681). Sun dogs as well as the 22° and 46° halos are explained in terms of refractions from ice crystals on pages 466–524.
meteoros.de
"46°-halo". Arbeitskreis Meteore e.V. Archived from the original on 31 March 2007. Retrieved 2007-04-16.
