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

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Original file (SVG file, nominally 612 × 612 pixels, file size: 220 bytes)

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Description A circle divided into a gibbous shape (light grey) and an astronomical crescent shape (dark grey) 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 light grey 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 dark grey 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.
Source Own work based on: Gibbous-Crescent-half-ellipse-in-circle.png
Author AnonMoos
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SVG development
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The SVG code is valid.
 
This trigonometry was created with a text editor.

Converted from the following PostScript code: 

%!
.75 0 0 setrgbcolor
306 396 144 0 360 arc
fill
0 .2 .85 setrgbcolor
306 396 144 90 -90 arcn 
39.765 0 72 64.471 72 144 rcurveto
0 79.529 -32.235 144 -72 144 rcurveto
closepath
fill
showpage
%EOF

Licensing

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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
current13:33, 13 July 2021Thumbnail for version as of 13:33, 13 July 2021612 × 612 (220 bytes)Sarang (talk | contribs)was unvalidable // Editing SVG source code using c:User:Rillke/SVGedit.js
01:41, 28 March 2016Thumbnail for version as of 01:41, 28 March 2016612 × 612 (199 bytes)KohanX (talk | contribs)Removed the dependency on color for information, to make it more accessible to color-deficient humans. It can now be referred to as shaded and unshaded areas instead of blue and red areas.
15:43, 7 November 2011Thumbnail for version as of 15:43, 7 November 2011612 × 612 (562 bytes)AnonMoos (talk | contribs)adjust margins, simplify code
02:14, 3 July 2006Thumbnail for version as of 02:14, 3 July 2006612 × 612 (672 bytes)AnonMoos (talk | contribs)compact exact PS conversion with margins
10:17, 16 June 2006Thumbnail for version as of 10:17, 16 June 2006500 × 500 (2 KB)Ttog~commonswiki (talk | contribs)== 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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