File:Sunrise-Sunset angle.svg

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Original file ‎(SVG file, nominally 1,017 × 518 pixels, file size: 70 KB)

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Description
English: A diagram of the sun at sunrise or sunset, showing the effects of atmospheric refraction.
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Own work;

US Navy Twilight time calculator (new link): "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)."
Author TWCarlson

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File history

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Date/TimeThumbnailDimensionsUserComment
current13:28, 19 December 2011Thumbnail for version as of 13:28, 19 December 20111,017 × 518 (70 KB)TWCarlson (talk | contribs)x
20:13, 8 December 2011Thumbnail for version as of 20:13, 8 December 20111,072 × 498 (66 KB)TWCarlson (talk | contribs)x
20:08, 8 December 2011Thumbnail for version as of 20:08, 8 December 20111,072 × 498 (381 KB)TWCarlson (talk | contribs)x
20:00, 8 December 2011Thumbnail for version as of 20:00, 8 December 20111,072 × 525 (218 KB)TWCarlson (talk | contribs)Fixing more text problems
19:39, 8 December 2011Thumbnail for version as of 19:39, 8 December 2011640 × 320 (205 KB)TWCarlson (talk | contribs)Fixed text problem
19:36, 8 December 2011Thumbnail for version as of 19:36, 8 December 2011640 × 320 (53 KB)TWCarlson (talk | contribs)Adjusted nominal size more
19:13, 8 December 2011Thumbnail for version as of 19:13, 8 December 20112,827 × 1,418 (223 KB)TWCarlson (talk | contribs)Decreased nominal size and added white background
19:01, 8 December 2011Thumbnail for version as of 19:01, 8 December 20115,670 × 2,841 (209 KB)TWCarlson (talk | contribs){{Information |Description ={{en|1=Diagram of the sun's position at sunrise and sunset.}} |Source ={{own}} |Author =TWCarlson |Date =2011-12-08 |Permission = |other_versions = }}

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