Original file (SVG file, nominally 612 × 612 pixels, file size: 220 bytes)
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Summary
DescriptionGibbous-Crescent-half-ellipse-in-circle.svg | 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 |
Other versions |
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SVG development InfoField | 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
Public domainPublic domainfalsefalse |
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: |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 13:33, 13 July 2021 | 612 × 612 (220 bytes) | Sarang | was unvalidable // Editing SVG source code using c:User:Rillke/SVGedit.js | |
01:41, 28 March 2016 | 612 × 612 (199 bytes) | KohanX | 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 2011 | 612 × 612 (562 bytes) | AnonMoos | adjust margins, simplify code | ||
02:14, 3 July 2006 | 612 × 612 (672 bytes) | AnonMoos | compact exact PS conversion with margins | ||
10:17, 16 June 2006 | 500 × 500 (2 KB) | Ttog~commonswiki | == 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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Width | 612 |
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Height | 612 |