What is horizon?

  • (noun): The great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth.
    Synonyms: celestial horizon
    See also — Additional definitions below


The horizon (or skyline) is the apparent line that separates earth from sky, the line that divides all visible directions into two categories: those that intersect the Earth's surface, and those that do not. At many locations, the true horizon is obscured by trees, buildings, mountains, etc., and the resulting intersection of earth and sky is called the visible horizon. When looking at a sea from a shore, the part of the sea closest to the horizon is called the offing. The word horizon derives from the Greek "ὁρίζων κύκλος" horizōn kyklos, "separating circle", from the verb ὁρίζω horizō, "to divide", "to separate", and that from "ὅρος" (oros), "boundary, landmark".

Read more about Horizon.

Some articles on horizon:

Horizon - Projective Geometry
... The horizon was identified as a central line in graphical perspective by Girard Desargues in his Perspective of 1636 ... The words on the level, level, parallel to the horizon are.. ... The words vertically, perpendicular to the horizon, and square to the horizon are also used to mean the same thing ...
Valley Metro (Phoenix) Bus Fleet - Fleet Descriptions - Retired
... LEDot signs that were replaced with Luminator Horizon signs in 2007 ... LEDot signs replaced with Luminator Horizon signs ... In 2007 their LEDot signs were replaced with Luminator Horizon signs ...
Sunrise Nippon/Horizon
... "Sunrise Nippon/Horizon" (Sunrise日本/Horizon?, "Sunrise Japan/Horizon") is the second single and first double A-side single of Japanese boy band Arashi ...
Linear (film) - Track Listing
... The film contains 11 tracks, 10 of which are from No Line on the Horizon ... "Winter", a track cut from No Line on the Horizon, is in the film while "I'll Go Crazy If I Don't Go Crazy Tonight" is not ... The film's running order is representative of No Line on the Horizon's track list as of May 2008 ...
... Soil Resources is a soil with a thin, dark surface horizon on a bleached subsurface horizon (an albic horizon) that tongues into a clay illuviation (Bt) horizon ... The Bt horizon has an irregular or broken upper boundary resulting from the tonguing of bleached soil material into the illuviation horizon ...

More definitions of "horizon":

  • (noun): The range of interest or activity that can be anticipated.
    Example: "It is beyond the horizon of present knowledge"
    Synonyms: view, purview
  • (noun): A specific layer or stratum of soil or subsoil in a vertical cross section of land.

Famous quotes containing the word horizon:

    In expanding the field of knowledge, we but increase the horizon of ignorance.
    Henry Miller (1891–1980)

    The world of the egotist is, inevitably, a narrow world, and the boundaries of self are limited to the close horizon of personality.... But, within this horizon, there is room for many attributes that are excellent....
    Ellen Glasgow (1873–1945)

    The horizon is more than a convention of landscape painting, less than truth.
    Mason Cooley (b. 1927)