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:
%! .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
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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
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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.
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File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 15:43, 7 November 2011 | | 612 × 612 (562 B) | AnonMoos | adjust margins, simplify code |
| 02:14, 3 July 2006 |  | 612 × 612 (672 B) | AnonMoos | compact exact PS conversion with margins | |
| 10:17, 16 June 2006 |  | 500 × 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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