Atmospheric optics wavelengths. A halo (ἅλως; also known as a nimbus, icebow or gloriole) is an optical phenomenon produced by the interaction of light from the sun or moon with ice crystals in the atmosphere, resulting in colored or white arcs, rings or spots in the sky. Many halos are positioned near the sun or moon, but others are elsewhere and even in the opposite part of the sky. They can also form around artificial lights in very cold weather when ice crystals called diamond dust are floating in the nearby air. There are many types of ice halos. They are produced
Aureole (horse) months before running in October at Newmarket here he contested the Middle Park Stakes, one of the year's most important two-year-old races. He finished sixth behind Nearula, a colt who went on to win the 1953 2000 Guineas. Aureole began his three-year-old season in the 2000 Guineas, in which he finished strongly to take fifth place behind Nearula. He was then moved up in distance for the Lingfield Derby Trial over one and a half miles. He won easily to establish himself as a leading contender for the Epsom Derby. In the week of his owner's coronation Aureole started at