Definition of Horizan
Ho*ri"zon (?), n. [F., fr. L.
horizon, fr. Gr. &?; (sc. &?;) the bounding line, horizon, fr.
&?; to bound, fr. &?; boundary, limit.] 1. The
circle 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.
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 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.
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 this
line.
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.
- Webster's Unabridged Dictionary (1913)
- The horizontal line that appears to separate the Earth from the sky.
- The range or limit of one's knowledge, experience or interest.
- (geology) A specific layer of soil or strata
French
- horizon
- The Nuttall Encyclopedia
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