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3 definitions found
 for Artificial horizon
From The Collaborative International Dictionary of English v.0.48 :

  Horizon \Ho*ri"zon\, n. [F., fr. L. horizon, fr. Gr. ? (sc. ?)
     the bounding line, horizon, fr. ? to bound, fr. ? boundary,
     limit.]
     1. The line which bounds that part of the earth's surface
        visible to a spectator from a given point; the apparent
        junction of the earth and sky.
        [1913 Webster]
  
              And when the morning sun shall raise his car
              Above the border of this horizon.     --Shak.
        [1913 Webster]
  
              All the horizon round
              Invested with bright rays.            --Milton.
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     2. (Astron.)
        (a) A plane passing through the eye of the spectator and
            at right angles to the vertical at a given place; a
            plane tangent to the earth's surface at that place;
            called distinctively the sensible horizon.
        (b) A plane parallel to the sensible horizon of a place,
            and passing through the earth's center; -- called also
            rational horizon or celestial horizon.
        (c) (Naut.) The unbroken line separating sky and water, as
            seen by an eye at a given elevation, no land being
            visible.
            [1913 Webster]
  
     3. (Geol.) The epoch or time during which a deposit was made.
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              The strata all over the earth, which were formed at
              the same time, are said to belong to the same
              geological horizon.                   --Le Conte.
        [1913 Webster]
  
     4. (Painting) The chief horizontal line in a picture of any
        sort, which determines in the picture the height of the
        eye of the spectator; in an extended landscape, the
        representation of the natural horizon corresponds with
        this line.
        [1913 Webster]
  
     5. The limit of a person's range of perception, capabilities,
        or experience; as, children raised in the inner city have
        limited horizons.
        [PJC]
  
     6. [fig.] A boundary point or line, or a time point, beyond
        which new knowledge or experiences may be found; as, more
        powerful computers are just over the horizon.
        [PJC]
  
     Apparent horizon. See under Apparent.
  
     Artificial horizon, a level mirror, as the surface of
        mercury in a shallow vessel, or a plane reflector adjusted
        to the true level artificially; -- used chiefly with the
        sextant for observing the double altitude of a celestial
        body.
  
     Celestial horizon. (Astron.) See def. 2, above.
  
     Dip of the horizon (Astron.), the vertical angle between
        the sensible horizon and a line to the visible horizon,
        the latter always being below the former.
  
     Rational horizon, and Sensible horizon. (Astron.) See
        def. 2, above.
  
     Visible horizon. See definitions 1 and 2, above.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Artificial \Ar`ti*fi"cial\, a. [L. artificialis, fr. artificium:
     cf. F. artificiel. See Artifice.]
     1. Made or contrived by art; produced or modified by human
        skill and labor, in opposition to natural; as, artificial
        heat or light, gems, salts, minerals, fountains, flowers.
        [1913 Webster]
  
              Artificial strife
              Lives in these touches, livelier than life. --Shak.
        [1913 Webster]
  
     2. Feigned; fictitious; assumed; affected; not genuine.
        "Artificial tears." --Shak.
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     3. Artful; cunning; crafty. [Obs.] --Shak.
        [1913 Webster]
  
     4. Cultivated; not indigenous; not of spontaneous growth; as,
        artificial grasses. --Gibbon.
        [1913 Webster]
  
     Artificial arguments (Rhet.), arguments invented by the
        speaker, in distinction from laws, authorities, and the
        like, which are called inartificial arguments or proofs.
        --Johnson.
  
     Artificial classification (Science), an arrangement based
        on superficial characters, and not expressing the true
        natural relations species; as, "the artificial system" in
        botany, which is the same as the Linn[ae]an system.
  
     Artificial horizon. See under Horizon.
  
     Artificial light, any light other than that which proceeds
        from the heavenly bodies.
  
     Artificial lines, lines on a sector or scale, so contrived
        as to represent the logarithmic sines and tangents, which,
        by the help of the line of numbers, solve, with tolerable
        exactness, questions in trigonometry, navigation, etc.
  
     Artificial numbers, logarithms.
  
     Artificial person (Law). See under Person.
  
     Artificial sines, tangents, etc., the same as logarithms
        of the natural sines, tangents, etc. --Hutton.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  artificial horizon
      n 1: a navigational instrument based on a gyroscope; it
           artificially provides a simulated horizon for the pilot
           [syn: artificial horizon, gyro horizon, flight
           indicator]

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