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

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Original file ‎(SVG file, nominally 612 × 612 pixels, file size: 604 bytes)

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Summary[edit]

Description A circle divided into a gibbous shape (left) and an astronomical crescent shape (right) 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 larger 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 smaller 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.
Date (PNG image and PostScript source code 2005)
Source

SVG version of Image:Gibbous-Crescent-half-ellipse-in-circle-outlined.png
Converted from a version of the following PostScript source code: 

%!
3 setlinewidth
300 156 144 0 360 arc gsave 1 setgray fill grestore stroke
300 12 moveto
39.765 0 72 64.471 72 144 rcurveto
0 79.529 -32.235 144 -72 144 rcurveto
stroke showpage
%%EOF
Author First SVG file uploaded by User:Ttog~commonswiki based on PNG image by AnonMoos
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Licensing[edit]

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
current13:01, 15 February 2013Thumbnail for version as of 13:01, 15 February 2013612 × 612 (604 bytes)AnonMoos (talk | contribs)adding XMLNS header to avoid future problems, simplifying, slight improvement in exactness
10:36, 14 February 2010Thumbnail for version as of 10:36, 14 February 2010612 × 612 (622 bytes)AnonMoos (talk | contribs)opaque only within circle
12:27, 18 December 2006Thumbnail for version as of 12:27, 18 December 2006612 × 612 (682 bytes)AnonMoos (talk | contribs)adding white background
02:12, 3 July 2006Thumbnail for version as of 02:12, 3 July 2006612 × 612 (598 bytes)AnonMoos (talk | contribs)compact exact PS conversion with margins
10:25, 16 June 2006Thumbnail for version as of 10:25, 16 June 2006510 × 510 (2 KB)Ttog~commonswiki (talk | contribs)transparent
10:23, 16 June 2006Thumbnail for version as of 10:23, 16 June 2006500 × 500 (2 KB)Ttog~commonswiki (talk | contribs)== Summary == A circle divided into a gibbous shape (left) and an astronomical crescent shape (right) 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 sp

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