Edward Emerson Barnard,
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(1913)
“ Its path around the sun lies between the earth and the sun. When beyond the sun, as seen from the earth, its fully illuminated side is turned toward us, and it appears round, like the full moon. When it is this side the sun and coming in between us and the sun, we see only part of the side that the sun is shining on, and it no longer appears round. As it comes in more between us and the sun, it assumes the crescent phase, becoming a thinner crescent, until it is a mere thread of light, and is lost in the superior brightness of the sun. ”

