Others prefer to use a lit artificial horizon. In older cockpits, the localizer scale below the artificial horizon is rather short. Provision was also made for an Artificial Horizon and oxygen equipment. It added an index arm with spirit levels to provide an artificial horizon. Tank's artificial horizon toppled (the cause is not explained). It replaces the traditional blue-over-brown artificial horizon. Artificial Horizon is a compilation album of remixed tracks by rock band U2. This set produced an artificial horizon that further eased head-up flying. A skyline is the artificial horizon that a city's overall structure creates. Professional sextants can mount an artificial horizon in place of the horizon-mirror assembly. The stand-by flight group displays an artificial horizon, for basic instrument meteorological conditions. An artificial horizon is usually a mirror that views a fluid-filled tube with a bubble. "Artificial Horizon" 1989 Individual and duo tracks with John Bischoff.