Planetary phase

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Notion

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Science and technology

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What Wikipedia says

A planetary phase is a certain portion of a planet's area that reflects sunlight as viewed from a given vantage point, as well as the period of time during which it occurs. The phase is determined by the phase angle, which is the angle between the planet, the Sun and the Earth.

Excerpt from the Wikipedia article “Planetary phase”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Statis Kalyvas - VT-2004 programme, Attribution, via Wikimedia Commons.