Horizon

Definition of Horizon

Ho`ri´zon
n.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.
2.(Astron.) 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.
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.
5.The limit of a person's range of perception, capabilities, or experience; as, children raised in the inner city have limited horizons.
6.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.
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
(Astron.) See def. 2, above.
Visible horizon
See definitions 1 and 2, above.

Related Words

azimuth, background, clear sight, color vision, command, compass, cone vision, day vision, daylight vision, discernment, domination, eye, eye-mindedness, eyereach, eyeshot, eyesight, false horizon, farsight, farsightedness, field of view, field of vision, keen sight, ken, limit of vision, limits, line of sight, naked eye, night vision, offing, outlook, outlook over, perception, peripheral field, peripheral vision, perspective, perspicacity, perspicuity, photopia, power of sight, prospect, purview, quick sight, range, reach, remote distance, rod vision, scan, scope, scope of vision, scotopia, sea line, seeing, sense of sight, sensible horizon, sight, sightedness, sightliness, skyline, survey, sweep, the distance, twilight vision, unobstructed vision, vanishing point, view, visible horizon, vision, vista, visual acuity, visual field, visual sense
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