Wonders of the Sky are lessons inspired by M. Minnaert's "Light and Color in the Outdoors
." This well-known book describes the physics behind unusual atmospheric optical effects. The slides offer images of numerous phenomena related to earth's sky and atmosphere that are mostly visible to the unaided eye. In particular, the interaction of light from the sun, moon, and stars with earth's atmosphere is emphasized. Topics of The Day Sky include the blue sky, rainbow phenomena, halos of the sun and moon (22-degree halo, sundogs), circumzenithal arc, parhelic circle, sun pillars, sun and moon coronas, iridescent or colored clouds, the glory, Spectre of the Brocken, heiligenschein, Bishop's Ring, concentric rings in tree branches, dappled light, camera halos, solar system objects visible in the day, airplane contrails, and odd clouds (mammatus, lenticular, virga).