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

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

Gibbous-Crescent-half-ellipse-in-circle-outlined.svg‎ (SVG file, nominally 612 × 612 pixels, file size: 682 B)

[edit] 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 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. See also Image:Gibbous-Crescent-half-ellipse-in-circle.svg

SVG version of Image:Gibbous-Crescent-half-ellipse-in-circle-outlined.png

[edit] Licensing

This image 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/Time	Thumbnail	Dimensions	User	Comment
current	12:27, 18 December 2006		612×612 (682 B)	AnonMoos (talk \| contribs)	(adding white background)
	02:12, 3 July 2006		612×612 (598 B)	AnonMoos (talk \| contribs)	(compact exact PS conversion with margins)
	10:25, 16 June 2006		510×510 (2 KB)	Ttog (talk \| contribs)	(transparent)
	10:23, 16 June 2006		500×500 (2 KB)	Ttog (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)