File:Gibbous-Crescent-half-ellipse-in-circle.svg

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[edit] Summary

A circle divided into a gibbous shape (red) and an astronomical crescent shape (blue) by a half-ellipse, where the major axis of the ellipse coincides with a diameter of the circle. According to geometry, an illuminated hemisphere of a sphere will appear to take on such gibbous or crescent shapes when viewed from an angle. In this case, the length of the major axis of the ellipse is twice the length of the minor axis (i.e. the eccentricity is half the square root of 3), so that the red gibbous area shows the theoretical shape of the visible lit area of the moon (for example) when the separation between the viewing angle and the angle of illumination (i.e. between Earth and Sun) is 60 degrees, while the blue crescent area shows the theoretical shape of the visible lit area of a sphere when the separation between the viewing angle and the angle of illumination is 120 degrees. See also Image:Gibbous-Crescent-half-ellipse-in-circle-outlined.svg

SVG version of Image:Gibbous-Crescent-half-ellipse-in-circle.png

Converted from the following PostScript code:

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 This vector image was created with a text editor. Its source code might contain additional information or higher level semantics of the topic.

[edit] Licensing

Public domain This work has been released into the public domain by its author, AnonMoos. This applies worldwide.
In some countries this may not be legally possible; if so:
AnonMoos grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

File history

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Date/TimeThumbnailDimensionsUserComment
current15:43, 7 November 2011Thumbnail for version as of 15:43, 7 November 2011612 × 612 (562 B)AnonMoos (adjust margins, simplify code )
02:14, 3 July 2006Thumbnail for version as of 02:14, 3 July 2006612 × 612 (672 B)AnonMoos (compact exact PS conversion with margins)
10:17, 16 June 2006Thumbnail for version as of 10:17, 16 June 2006500 × 500 (2 KB)Ttog (== Summary == A circle divided into a gibbous shape (red) and an astronomical crescent shape (blue) by a half-ellipse, where the major axis of the ellipse coincides with a diameter of the circle. According to geometry, an illuminated hemisphere of a sphe)
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This file contains additional information, probably added from the digital camera or scanner used to create or digitize it. If the file has been modified from its original state, some details may not fully reflect the modified file.
Width 612
Height 612
Short title Moon Gibbous/Crescent shapes (filled version) - circle divided by half-ellipse whose major axis is the diameter of the circle, and whose minor axis is half the major axis.
Retrieved from "http://en.wikipedia.org/wiki/File:Gibbous-Crescent-half-ellipse-in-circle.svg"
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