artificial horizon

a level, as a surface of mercury, used in determining the altitudes of stars. Compare level ( def 35 ).
the bubble in a sextant or octant for aerial use.
Also called flight indicator, gyro horizon. Aeronautics. an instrument that indicates the banking and pitch of an aircraft with respect to the horizon.

1795–1805 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
artificial horizon
1.  Also called: gyro horizon an aircraft instrument, using a gyroscope, that indicates the aircraft's attitude in relation to the horizontal
2.  astronomy a level reflecting surface, such as one of mercury, that measures the altitude of a celestial body as half the angle between the body and its reflection

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