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

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Full resolution(SVG file, nominally 612 × 612 pixels, file size: 562 B)

[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
Notepad icon small.svg
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

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current15:43, 7 November 2011Thumbnail for version as of 15:43, 7 November 2011612 × 612 (562 B)AnonMoosadjust margins, simplify code
02:14, 3 July 2006Thumbnail for version as of 02:14, 3 July 2006612 × 612 (672 B)AnonMooscompact 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
The following pages on the English Wikipedia link to this file (pages on other projects are not listed):

Global file usage

The following other wikis use this file:

Metadata

Personal tools
Namespaces

Variants
Views
Actions
Navigation
Interaction
Toolbox