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
Nimbus (motorcycle) Nimbus (motorcycle) The Nimbus was a Danish motorcycle produced from 1919 to 1960 by Fisker and Nielsen of Copenhagen, Denmark, also manufacturers of "Nilfisk" brand vacuum cleaners (now Nilfisk-Advance). Two basic models were produced, both with a 750 cc four-cylinder engine. In partnership with H.M. Nielsen, Peder Andersen Fisker produced electric motors and, from around 1910, the first vacuum cleaners in Europe. Fisker believed he could develop a motorcycle that had its own form, and in late 1918 decided to construct a prototype to his own design. The first Nimbus motorcycle had a four-cylinder inline engine of capacity, which drove