A planar reflecting surface that can be adjusted to coincide with the astronomical horizon, that is, can be made perpendicular to the zenith. This instrument is used, usually in conjunction with others, in observing celestial bodies. See horizon.
An instrument which enables a pilot to determine the attitude of the aircraft in relation to the horizon, i.e. whether the aircraft is nose-up, nose-down, or banking left or right.
An instrument, operated by a gyroscope, devised to keep an indicator permanently parallel with the true horizon and thus show the pilot the attitude of his aeroplane when flying in cloud or bad visibility.
a navigational instrument based on a gyroscope; provides an artificial horizon for the pilot
a gyroscopic instrument for indicating the attitude of an aircraft with respect to the horizontal
an instrument that shows the pilot the aircraft position to the horizon
Any device for giving a horizon reference identical except for dip to that of an observer at sea.
A panel instrument depicting an aircraft's attitude with respect to the earth's horizon. It continuously updates and displays a symbol of the horizon and of the aircraft's wings and nose in relation to that horizon.