Earthlight

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Earthlight

</dt>
The illumination of the dark part of the moon's disk produced by sunlight reflected onto the moon from the earth's surface and atmosphere. Also called earthshine. </dd>
Spectroscopic observations reveal that earthlight is relatively richer in blue light than is direct sunlight; this condition results from the fact that an appreciable part of the total earth reflection is backward-scattered light which, in accordance with Rayleigh law, is relatively rich in the blue and poor in the red. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use