The Sun's Frozen Crown
A luminous ring encircles the sun above Tulancingo, Hidalgo, Mexico—a celestial crown suspended in the midday sky. The 22° solar halo forms when sunlight passes through hexagonal ice crystals in high-altitude cirrostratus clouds.
—Dante Iván Delgadillo-Licona, Universidad Tecnológica de Tulancingo, Tulancingo, Mexico
