File:Twilight terminator - 01.jpg
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DescriptionTwilight terminator - 01.jpg |
After sunset the sky remains light for some distance over the earth. This is caused by diffraction and <a href="http://en.wikipedia.org/wiki/Scattering" rel="nofollow">scattering</a> of light through the atmosphere and also reflection of light back off the surface. This enables light from the sun to appear to "bend" round the earth and to continue to illuminate the sky, albeit at reduced intensity. This illumination is described by the term twilight. The arrows on this diagram show a few of the very many paths that light can take through the atmosphere to spread the illumination of the sun into the area of twilight on the night side of the earth. The thickness of the atmosphere is vastly exaggerated in this illustration. Half the mass of the atmosphere is below 5.6 km / 3.5 miles from sea level on the earth (although small traces of the atmosphere do extend very far out into space, causing - for example - satellite drag). By comparison, the mainland of Britain (to the left of the illustration) is approximately 300 miles wide. Part of a <a href="https://www.flickr.com/photos/dominicspics/sets/72157624781879918/">set</a> / <a href="https://www.flickr.com/photos/dominicspics/sets/72157624781879918/show/">Slideshow</a> featuring images of stars, the night sky and the occasional meteor taken during the peak of the Perseid Meteor Shower in August 2010. |
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Date | |||
Source | Flickr: Twilight | ||
Author | Dominic Alves | ||
Permission (Reusing this file) |
This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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current | 09:59, 23 October 2011 | 3,000 × 2,000 (980 KB) | Flickr upload bot (talk | contribs) | Uploaded from http://flickr.com/photo/64097751@N00/4915203511 using Flickr upload bot |
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Number of components | 3 |
Horizontal resolution | 72 dpi |
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Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 07:03, 22 August 2010 |
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Date and time of digitizing | 08:03, 22 August 2010 |
Date metadata was last modified | 08:03, 22 August 2010 |