According to photographs made during NASA's Surveyor project (a series of unmanned landers on the moon), a total eclipse of the sun by the Earth shows several bright spots all around the limb of our planet. Could it be that the atmospheric halo phenomenon Pillar, created by "horizontal" ice crystal plates in Cirrus clouds near Earth's limb, is capable of projecting the reflected sun's light all the way toward the moon's surface? Further thinking... imagine someone standing in the central region of Earth's umbra (the darkest part of Earth's shadow), and looking up at the silhouetted Earth, would that person see the circle-shaped arrangement of the sun's reflection in plate-shaped ice crystals all along Earth's limb? (that is: the upper regions of Earth's atmosphere where the icy Cirrus clouds are located). The same question could be asked if the optical phenomenon Green Flash is also involved (a very thin green colored bright "circle" all along Earth's limb). Perhaps this is the explanation of the vague greenish or bluish-greenish streaks and spots appearing in the (mostly copper colored) umbra seen during a total lunar eclipse.
Note: if the lunar surface didn't had its strong retro-reflection ("Dry" Heiligenschein effect), then the moon would appear completely black during each one of the total lunar eclipses.
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