For other uses of horizon, see Horizon (disambiguation)

The horizon or Kshitij(in Hindi)(from Greek orizein, to limit) is the line that separates earth from sky. More precisely, it is the line that divides all of the directions you can possibly look into, into two categories: those which intersect the Earth, and those which do not. At many locations, the true horizon is obscured by trees, buildings, mountains, etc. The resulting intersection of earth and sky is instead known as the visible horizon. However, if you are on a ship at sea, the true horizon is strikingly apparent. Historically, the distance to the visible horizon has been extremely important as it represented the maximum range of communication and vision before the development of the radio and the telegraph. Even today, when flying an aircraft under Visual Flight Rules, a technique called attitude flying is used to control the aircraft, where the pilot uses the relationship between the aircraft's nose and the horizon to control the aircraft. He also retains his spatial orientation by referring to the horizon.

In many contexts, in particular perspective drawing, the curvature of the earth is typically disregarded and the horizon is considered the theoretical line to which points on any horizontal plane converge (when projected onto the picture plane) as their distance from the viewer increases. Note that, for viewers near the ground, the difference between this geometrical horizon (which assumes a perfectly flat, infinite ground plane) and the true horizon (which assumes a spherical Earth surface) is typically imperceptibly small. That is, if the Earth were truly flat, there would still be a visible horizon line, and, to ground based viewers, its position and appearance would not be significantly different from what we see on our curved Earth.

More on [ Horizon ]

Blitzkrieg - Burning Horizon - Twitter Search

Free Games: Blitzkrieg Burning Horizon http://retwt.me/vcFZ
freeegame (Free Game Blog) Fri, 02 Oct 2009 13:18:16 -0000
Free Games: Blitzkrieg Burning Horizon http://retwt.me/vcFZ

Subscribe to Blitzkrieg_-_Burning_Horizon RSS feed