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earth·shine | \ ˈərth-ˌshīn 
\
\Definition of earthshine
: sunlight reflected by the earth that illuminates the dark part of the moon
Because the moon will be near half phase, earthshine will brighten the dark portion of the moon. — Astronomy
— called also earthlight
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Time Traveler for earthshine
The first known use of earthshine was in 1834
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