In astronomy, "Earthlight" refers to the illumination of the Moon by sunlight that is reflected off the Earth. When the Earth’s surface, including oceans and land, reflects sunlight, some of that light can reach the Moon, providing a faint glow. This phenomenon is most noticeable when the Moon is in its crescent phase, as the darkened portion of the Moon can be subtly illuminated by this reflected Earth's light, making it visible even in the daytime.

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