Found 2 items, similar to Artificial horizon.
English → English
Definition: artificial horizon
n : a navigational instrument based on a gyroscope; provides an
artificial horizon for the pilot [syn: gyro horizon
, flight indicator
English → English
Definition: Artificial horizon
, n. [F., fr. L. horizon, fr. Gr. ? (sc. ?)
the bounding line, horizon, fr. ? to bound, fr. ? boundary,
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.
And when the morning sun shall raise his car
Above the border of this horizon. --Shak.
All the horizon round
Invested with bright rays. --Milton.
(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
or celestial horizon
(c) (Naut.) The unbroken line separating sky and water, as
seen by an eye at a given elevation, no land being
3. (Geol.) The epoch or time during which a deposit was made.
The strata all over the earth, which were formed at
the same time, are said to belong to the same
geological horizon. --Le Conte.
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
5. The limit of a person's range of perception, capabilities,
or experience; as, children raised in the inner city have
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.
. See under Apparent
, 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
. (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.
, and Sensible horizon
. (Astron.) See
def. 2, above.
. See definitions 1 and 2, above.
, 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.
Lives in these touches, livelier than life. --Shak.
2. Feigned; fictitious; assumed; affected; not genuine.
3. Artful; cunning; crafty. [Obs.] --Shak.
4. Cultivated; not indigenous; not of spontaneous growth; as,
artificial grasses. --Gibbon.
(Rhet.), arguments invented by the
speaker, in distinction from laws, authorities, and the
like, which are called inartificial arguments or proofs.
(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.
. See under Horizon
, any light other than that which proceeds
from the heavenly bodies.
, 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.
(Law). See under Person
, etc., the same as logarithms
of the natural sines, tangents, etc. --Hutton.