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The聽horizon聽or聽skyline聽is the apparent line that separates聽earth聽from聽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聽visible horizon. When looking at a sea from a shore, the part of the sea closest to the horizon is called the聽offing. The word聽horizon聽derives from the聽Greek聽芦峤佅佄断壩 魏蠉魏位慰蟼禄聽horiz艒n kyklos, 芦separating circle禄,from the verb聽峤佅佄断壜爃oriz艒, 芦to divide禄, 芦to separate禄, and that from 芦峤呄佄肯偮 (oros), 芦boundary, landmark禄.

Historically, the distance to the visible horizon has long been vital to survival and successful navigation, especially at sea, because it determined an observer’s maximum range of vision and thus of聽communication, with all the obvious consequences for safety and the transmission of information that this range implied. This importance lessened with the development of the聽radio聽and the聽telegraph, but even today, when flying an聽aircraft聽under聽visual flight rules, a technique called聽attitude flying聽is used to control the aircraft, where the pilot uses the visual relationship between the aircraft’s nose and the horizon to control the aircraft. A pilot can also retain his or her聽spatial orientation聽by referring to the horizon.

In many contexts, especially聽perspective聽drawing, the curvature of the聽Earth聽is disregarded and the horizon is considered the theoretical line to which points on any聽horizontal plane聽converge (when projected onto the picture plane) as their distance from the observer increases. For observers near聽sea level聽the difference between this聽geometrical horizon聽(which assumes a perfectly flat, infinite ground plane) and the聽true horizon聽(which assumes a聽spherical Earth聽surface) is imperceptible to the naked eye dubious聽鈥撀燿iscuss but for someone on a 1000-meter hill looking out to sea the true horizon will be about a degree below a horizontal line.

Alexis

Creador de Gglassday, la web donde encontrar谩s toda la informaci贸n sobre Google Glass y similares. As铆 como tambi茅n redactor y editor de la misma.

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