Word: earthlight
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Dates: during 1950-1959
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...moon-based songwriter would have his troubles; an obvious rhyme for earth is girth, and in the radiance of earthlight, a moon-maiden's face would shine bluish green. But if science fiction is somewhat short on romance, it does offer today's readers the kind of adventurous, he-man escape from gravity once found in turn-of-the-century western yarns-a commodity not to be dismissed in this day of beatniks and Angry Young...
...best way to estimate the earth's overall albedo is to measure the brightness of "earthlight" on sunless parts of the moon, allowing for the earth's size and distance, and how much of its disk is in sunlight. Figured this way, the earth's albedo is about .40, which means that it reflects four-tenths of the sunlight that falls on it. It is dimmer than cloud-covered Venus (.64) but much brighter than the naked, rocky moon (.073). The brightness varies a good deal with the season, probably because of changes in the amount...
...color of the earth as seen from space can be judged in the same way. Earthlight is definitely blue, apparently because of blue light reflected by fine particles in the atmosphere. So the earth looks blue from above for the same reason that its sky looks blue from below...