File:Angulo orto ocaso.svg

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Original file ‎(SVG file, nominally 1,017 × 518 pixels, file size: 71 KB)

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Galego: Efecto da refracción atmosférica perante o orto/ocaso solares no planeta Terra.
US Navy Twilight time calculator: "For computational purposes, sunrise or sunset is defined to occur when the geometric zenith distance of center of the Sun is 90.8333 degrees. That is, the center of the Sun is geometrically 50 arcminutes below a horizontal plane. For an observer at sea level with a level, unobstructed horizon, under average atmospheric conditions, the upper limb of the Sun will then appear to be tangent to the horizon. The 50-arcminute geometric depression of the Sun's center used for the computations is obtained by adding the average apparent radius of the Sun (16 arcminutes) to the average amount of atmospheric refraction at the horizon (34 arcminutes)."
Date 8/01/2012
Source File:Sunrise-Sunset angle.svg
Author User:TWCarlson
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Date/TimeThumbnailDimensionsUserComment
current19:56, 8 January 2012Thumbnail for version as of 19:56, 8 January 20121,017 × 518 (71 KB)Suarez ruibal (talk | contribs)corrección texto
19:49, 8 January 2012Thumbnail for version as of 19:49, 8 January 20121,017 × 518 (71 KB)Suarez ruibal (talk | contribs)representa o efecto da refracción atmosférica perante o orto/ocaso solares no planeta Terra. US Navy Twilight time calculator: "For computational purposes, sunrise or sunset is defined to occur when the geometric zenith distance of center of the Sun is

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