விளக்கம்Gibbous-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.
மூலம்	Own work based on: Gibbous-Crescent-half-ellipse-in-circle.png
ஆசிரியர்	AnonMoos
ஒத்தக்கோப்பு	Outlined
SVG genesis InfoField	The SVG code is valid.  This trigonometry was created with a text editor.

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This work has been released into the public domain by its author, AnonMoos. This applies worldwide. சில நாடுகளில் இது சாத்தியமில்லாது போகலாம். அவ்வாறாயின் : AnonMoos grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.